diff --git a/docs/configuration.md b/docs/configuration.md
index 85c5fce..0f08823 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -549,3 +549,16 @@ Use this sequence for changes with runtime impact:
 4. Verify `GET /healthz`.
 5. Confirm MQTT ingest, Nodus metadata, Home Assistant discovery, or farmOS
    status as appropriate for the change.
+
+Barometric pressure gauges use the altitude entered in General Settings
+(`[Astral].ALTITUDE`, metres) to center raw/absolute pressure ranges on standard
+atmospheric pressure at that elevation, with at least 50 hPa of weather margin
+on either side. Metric bounds round outward to 10 hPa; Imperial bounds round
+outward to 0.1 inHg. Refresh the dashboard after changing altitude. Blank or
+invalid altitude retains the broad default range for raw pressure.
+
+Sea-level-corrected readings (Ecowitt relative pressure, WeeWX barometer, and
+BME/VPD/AQI sensors with altitude calibration) instead use a sea-level range:
+960–1070 hPa or 28.4–31.4 inHg. Explicit absolute-pressure metrics always use
+site altitude. Gauge scaling does not change measurements, history, MQTT, or
+calibration values.
diff --git a/sensorius/__init__.py b/sensorius/__init__.py
index 4f5d076..08ede94 100644
--- a/sensorius/__init__.py
+++ b/sensorius/__init__.py
@@ -4,4 +4,4 @@
 release notes, and supporting tooling can report a consistent build identity.
 """
 
-__version__ = "v0.26.261.6"
+__version__ = "v0.26.261.7"
diff --git a/sensorius/saiHtml.py b/sensorius/saiHtml.py
index 1056dd0..8f450f0 100644
--- a/sensorius/saiHtml.py
+++ b/sensorius/saiHtml.py
@@ -191,7 +191,7 @@ def normalize_dashboard_metric_set(value: object) -> str:
     return "All" if compact in {"all", "showall"} else "Pick 6"
 
 
-def render_dashboard(sensor_id, sensor, available, all_values, all_stats, mqtt_ingest, switch_controllers=None, sensor_locations=None, gauge_config=None, gauge_size="Small", expected_gauge_map=None, expected_display_style_map=None, display_style=None, astro_payload=None, biodynamic_payload=None, weather_forecast_provider="met_no", weather_forecast_theme="pollinator", dashboard_background_theme="leaf", dashboard_metric_set="Pick 6", dashboard_custom_theme_style=""):
+def render_dashboard(sensor_id, sensor, available, all_values, all_stats, mqtt_ingest, switch_controllers=None, sensor_locations=None, gauge_config=None, gauge_size="Small", expected_gauge_map=None, expected_display_style_map=None, display_style=None, astro_payload=None, biodynamic_payload=None, weather_forecast_provider="met_no", weather_forecast_theme="pollinator", dashboard_background_theme="leaf", dashboard_metric_set="Pick 6", dashboard_custom_theme_style="", pressure_altitude=None, pressure_sensor_context=None):
     """Yield the complete Sensorius dashboard HTML document."""
 
     import json
@@ -2324,6 +2324,9 @@ def _format_stat_value(stat_value):
     
     yield "<script type='module'>"
     yield "\"use strict\";"
+    yield f"import {{ pressureGaugeConfig }} from '/ui_static/js/pressure_gauges.js?v={APP_VERSION}';"
+    yield f"const pressureAltitude = {json.dumps(pressure_altitude)};"
+    yield f"const pressureSensorContext = {json.dumps(pressure_sensor_context or {})};"
     yield f"import {{ startRainGauges }} from '/ui_static/js/rain_gauges.js?v={APP_VERSION}';"
     
     yield "let stepCount = 0;"
@@ -4860,7 +4863,7 @@ def _format_stat_value(stat_value):
     yield "    const canvas = document.getElementById(canvasId);"
     yield "    const label = document.getElementById(labelId);"
     yield "    if (!canvas || !label) return;"  
-    yield "    const config = gaugeConfig?.[metric];"
+    yield "    const config = pressureGaugeConfig(metric, gaugeConfig?.[metric], pressureAltitude, pressureSensorContext[sensor]);"
     yield "    if (!config) return;"
     yield "    let value = currentValues?.[sensor]?.[metric];"
     yield "    const isNull = (value == null);"
@@ -5397,7 +5400,7 @@ def _format_stat_value(stat_value):
     yield "      const val  = vset[metric];"
     yield "      const labelEl = document.getElementById(`${safe}_val`);"
     yield "      const g       = window[`${safe}_gauge`];"
-    yield "      const metricConfig = gaugeConfig?.[metric] || {};"
+    yield "      const metricConfig = pressureGaugeConfig(metric, gaugeConfig?.[metric], pressureAltitude, pressureSensorContext[sid]) || {};"
     yield "      const renderMode = ((metricConfig.render) || '').toLowerCase();"
     yield "      const valueMetric = metricConfig.value_metric || metric;"
     yield "      const statsMetric = metricConfig.stats_metric || metric;"
diff --git a/sensorius/saiWebRoutes.py b/sensorius/saiWebRoutes.py
index 75af837..871b328 100644
--- a/sensorius/saiWebRoutes.py
+++ b/sensorius/saiWebRoutes.py
@@ -814,6 +814,7 @@ def _get_cached_display_settings() -> dict[str, object]:
             return dict(_DASHBOARD_DISPLAY_SETTINGS_CACHE[1])
         fresh_settings = saiSettings(apply_live=False)
         payload = {
+            "pressure_altitude": fresh_settings.get_setting("Astral", "ALTITUDE", ""),
             "gauge_size": fresh_settings.get_setting("Display", "gauge_size") or "Small",
             "display_style": fresh_settings.get_setting("Display", "display_style") or "Gauge",
             "unit_system": normalize_display_unit_system(
@@ -3104,7 +3105,18 @@ def _is_weewx_dashboard_sensor(sid: str) -> bool:
         sensor_mgr = sensor_settings_mgr or _get_sensor_settings_manager()
         expected_gauge_map = {}
         expected_display_style_map = {}
+        pressure_sensor_context = {}
         for sid in all_values:
+            if sensor_mgr is not None:
+                try:
+                    pressure_doc = await asyncio.to_thread(sensor_mgr.load, sid)
+                except FileNotFoundError:
+                    pressure_doc = {}
+                pressure_sensor_context[sid] = {
+                    "device": (pressure_doc.get("Sensor") or {}).get("DEVICE", ""),
+                    "altitude": ((pressure_doc.get("Calibration") or {}).get("Device") or {}).get("ALTITUDE_METERS"),
+                    "weewx": _is_weewx_dashboard_sensor(sid),
+                }
             try:
                 configured_metrics = sensor_mgr.get_display_metrics(sid)
             except Exception:
@@ -3595,6 +3607,8 @@ def _resolve_meas_status_for_sid(sid: str) -> str:
                 sensor_locations = sensor_locations,
                 gauge_config=gauge_config, 
                 gauge_size = gaugeSize,
+                pressure_altitude=display_settings.get("pressure_altitude"),
+                pressure_sensor_context=pressure_sensor_context,
                 expected_gauge_map = expected_gauge_map,
                 expected_display_style_map = expected_display_style_map,
                 display_style = displayStyle,
diff --git a/testApparatus/playwright_host.py b/testApparatus/playwright_host.py
index 2949f90..12295cb 100644
--- a/testApparatus/playwright_host.py
+++ b/testApparatus/playwright_host.py
@@ -208,3 +208,23 @@ def weather_climate() -> dict:
             "start_date": "1991-01-01", "end_date": "2026-09-13", "averages": {
         "temperature_c": 20, "humidity_pct": 55, "wind_kmh": 16.09344, "rain_mm": 2.54, "samples": 35,
     }}
+
+
+@app.get("/pressure-gauges", response_class=HTMLResponse)
+def pressure_gauges(unit_system: str = "Metric", altitude: str = "1609.3") -> HTMLResponse:
+    """Render raw and corrected pressure sensors together for browser checks."""
+    from sensorius.saiDisplayUnits import apply_display_units_to_gauge_config
+
+    values = {
+        "raw": {"Baro-Pressure": 835.0, "Plant Baro-Pressure": 836.0},
+        "corrected": {"Baro-Pressure": 1022.5},
+        "ecowitt": {"Gateway Baro-Pressure": 1032.5, "Gateway Absolute Baro-Pressure": 840.0},
+    }
+    return HTMLResponse("".join(render_dashboard(
+        "All", None, list(values), values, {}, SimpleNamespace(expected_gauge_map={}),
+        gauge_config=apply_display_units_to_gauge_config(get_gauge_config(), unit_system),
+        expected_gauge_map={sid: list(metrics) for sid, metrics in values.items()},
+        expected_display_style_map={sid: {} for sid in values}, display_style="Gauge",
+        pressure_altitude=altitude,
+        pressure_sensor_context={"corrected": {"device": "bme280", "altitude": 1609.3}},
+    )))
diff --git a/tests/pressure-gauges.spec.js b/tests/pressure-gauges.spec.js
new file mode 100644
index 0000000..604ff7f
--- /dev/null
+++ b/tests/pressure-gauges.spec.js
@@ -0,0 +1,76 @@
+import { test, expect } from '@playwright/test';
+import { pressureGaugeConfig } from '../ui_static/js/pressure_gauges.js';
+
+const base = { unit: 'hPa', min: 700, max: 1100 };
+test('pressure ranges cover altitude bounds, fallback and corrected readings', () => {
+  for (const altitude of ['', null, undefined, 'NaN', Infinity, -501, 10001]) {
+    expect(pressureGaugeConfig('Baro-Pressure', base, altitude)).toBe(base);
+  }
+  for (const altitude of [-500, 0, 1609.3, 10000]) {
+    const scale = pressureGaugeConfig('Pressure', base, altitude);
+    const center = 1013.25 * Math.pow(1 - altitude / 44330, 5.255);
+    expect(center - scale.min).toBeGreaterThanOrEqual(50);
+    expect(scale.max - center).toBeGreaterThanOrEqual(50);
+    expect(scale.ticks[0]).toBe(scale.min);
+    expect(scale.ticks.at(-1)).toBe(scale.max);
+  }
+  for (const device of ['bme280', 'bme680', 'bme688', 'vpd', 'avpd', 'apvpd', 'aqi', 'ecowitt', 'weewx']) {
+    const context = { device, altitude: 1609.3 };
+    expect(pressureGaugeConfig('Baro-Pressure', base, 1609.3, context).min).toBe(960);
+    expect(pressureGaugeConfig('Absolute Baro-Pressure', base, 1609.3, context).min).toBe(780);
+  }
+  expect(pressureGaugeConfig('Temperature', base, 1609.3)).toBe(base);
+  expect(base).toEqual({ unit: 'hPa', min: 700, max: 1100 });
+});
+
+for (const units of ['Metric', 'Imperial']) {
+  test(`mixed pressure sensors render altitude scales in ${units}`, async ({ page }, testInfo) => {
+    await page.route('https://cdn.jsdelivr.net/**', route => route.fulfill({ contentType: 'application/javascript', body: '' }));
+    await page.addInitScript(() => {
+      window.pressureTestGauges = [];
+      window.Gauge = class {
+        constructor(canvas) { this.id = canvas.id; window.pressureTestGauges.push(this); }
+        setOptions(options) { this.options = options; return this; }
+        setMinValue(value) { this.min = value; }
+        set(value) { this.value = value; }
+        render() {}
+      };
+    });
+    await page.goto(`/pressure-gauges?unit_system=${units}`, { waitUntil: 'domcontentloaded' });
+    await expect.poll(() => page.evaluate(() => window.pressureTestGauges.length)).toBe(5);
+    const gauges = await page.evaluate(() => window.pressureTestGauges.map(g => ({ id: g.id, min: g.min, max: g.maxValue, ticks: g.options.staticLabels.labels, value: g.value })));
+    for (const gauge of gauges) {
+      const corrected = gauge.id.startsWith('corrected_') || gauge.id === 'ecowitt_Gateway_Baro-PressureGauge';
+      const raw = gauge.id.startsWith('raw_') || gauge.id.includes('Absolute');
+      expect(corrected || raw).toBe(true);
+      expect([gauge.min, gauge.max]).toEqual(units === 'Metric' ? (corrected ? [960, 1070] : [780, 890]) : (corrected ? [28.4, 31.4] : [23.1, 26.2]));
+      expect(gauge.ticks[0]).toBe(gauge.min);
+      expect(gauge.ticks.at(-1)).toBe(gauge.max);
+    }
+    await expect(page.locator('#corrected_Baro-Pressure_val')).toContainText(units === 'Metric' ? '1022.5 hPa' : '30.19 inHg');
+    await page.screenshot({ path: testInfo.outputPath(`pressure-${units}.png`), fullPage: true });
+  });
+}
+
+test('fallback canvas keeps altitude bounds after a live update', async ({ page }, testInfo) => {
+  await page.route('https://cdn.jsdelivr.net/**', route => route.fulfill({ contentType: 'application/javascript', body: '' }));
+  await page.route('**/*json_only=true*', route => route.fulfill({ json: {
+    available: ['raw'], values: { raw: { 'Baro-Pressure': 845 } }, timestamps: { raw: '2026-09-18T12:00:00' }, stats: {},
+  } }));
+  await page.addInitScript(() => {
+    window.pressureLabels = [];
+    const fillText = CanvasRenderingContext2D.prototype.fillText;
+    CanvasRenderingContext2D.prototype.fillText = function(text, ...args) {
+      if (this.canvas.id === 'raw_Baro-PressureGauge') window.pressureLabels.push(String(text));
+      return fillText.call(this, text, ...args);
+    };
+  });
+  await page.goto('/pressure-gauges', { waitUntil: 'load' });
+  await page.evaluate(() => { window.pressureLabels = []; return window.updateGauges({ ignoreVisibility: true, ignoreModal: true }); });
+  await expect(page.locator('#raw_Baro-Pressure_val')).toContainText('845.0 hPa');
+  const labels = await page.evaluate(() => window.pressureLabels);
+  expect(labels).toContain('780');
+  expect(labels).toContain('890');
+  expect(labels).not.toContain('700');
+  await page.screenshot({ path: testInfo.outputPath('pressure-fallback.png'), fullPage: true });
+});
diff --git a/ui_static/js/pressure_gauges.js b/ui_static/js/pressure_gauges.js
new file mode 100644
index 0000000..a38d75c
--- /dev/null
+++ b/ui_static/js/pressure_gauges.js
@@ -0,0 +1,31 @@
+/** Display-only pressure ranges; stored measurements retain their original values. */
+export function pressureGaugeConfig(metric, config, altitude, context = {}) {
+  if (!config || !(metric === 'Pressure' || metric === 'Baro-Pressure' || metric.endsWith(' Baro-Pressure'))) return config;
+  const device = String(context.device || '').trim().toLowerCase();
+  const calibrationAltitude = Number(context.altitude);
+  const corrected = !metric.includes('Absolute Baro-Pressure') && (
+    metric.startsWith('Gateway ') || context.weewx || device.includes('ecowitt') || device.includes('weewx') ||
+    (['aqi', 'bme680', 'bme688', 'vpd', 'avpd', 'bme280', 'apvpd'].includes(device) &&
+      Number.isFinite(calibrationAltitude) && calibrationAltitude !== 0)
+  );
+  let center = 1013.25;
+  if (!corrected) {
+    if (altitude == null || String(altitude).trim() === '') return config;
+    const meters = Number(altitude);
+    if (!Number.isFinite(meters) || meters < -500 || meters > 10000) return config;
+    center *= Math.pow(1 - meters / 44330, 5.255);
+  }
+  const imperial = config.unit === 'inHg';
+  const factor = imperial ? 0.0295299830714 : 1;
+  const rounding = imperial ? 0.1 : 10;
+  const step = imperial ? 0.5 : 20;
+  const clean = value => Number(value.toFixed(6));
+  const min = clean(Math.floor((center - 50) * factor / rounding) * rounding);
+  const max = clean(Math.ceil((center + 50) * factor / rounding) * rounding);
+  const ticks = [];
+  for (let tick = min; tick < max; tick = clean(tick + step)) {
+    if (tick === min || clean(max - tick) >= step) ticks.push(tick);
+  }
+  ticks.push(max);
+  return { ...config, min, max, ticks, zones: [{ min, max, strokeStyle: '#add8e6' }] };
+}