Radial Gauge Display
Show a reading on a circular dial with the Radial Gauge — a configurable sweep angle, tick marks, and condition arcs.
The Radial Gauge draws each reading as a needle on a circular dial. The dial is scaled between a minimum and a maximum, the condition bands you define paint colored arcs around it, and a configurable sweep angle lets the dial range from a near-full circle to a tight arc. It's the instrument-panel look — the reading you'd expect on a pressure gauge, a tachometer, or a fill indicator.
It is the sixth display type of the Last Data widget, alongside Number, Doughnut, Pie, Tube, and the horizontal Gauge.
Radial gauge vs. the horizontal Gauge
Both plot a value against a scale with condition bands, so choose by shape and context:
The Gauge is a horizontal track — compact, and it lines up neatly when several sit in a row.
The Radial Gauge is a round dial — it reads like a physical instrument and carries more visual presence on a control-center screen, which suits a small number of headline readings rather than a dense row of many.
When to choose it
A flagship reading on a NOC or operations dashboard where an instrument dial communicates status instantly across a room.
A value with a natural full-scale point — pressure against its rated maximum, a reserve against capacity, throughput against a ceiling.
Any threshold reading where you want condition bands rendered as arcs the eye can read at a glance.
Configure a Radial Gauge display
The setup follows the standard Last Data widget flow — add a datasource, choose the device and a numeric metric, and define Conditions. The radial-gauge-specific settings live on the Appearance tab once you select the type.
Open the dashboard in edit mode and click Last data in the widget picker.
On the Datasource tab, click Add datasource, choose the device, and Add metric — set Data type to Telemetry and pick the numeric reading.
Click Conditions: N and define a Default color and one band per status (each with a From/To range and color). On a Radial Gauge these render as colored arcs around the dial. Save the modal.
Click Next to open Appearance, and enter a Widget name and optional Description.
Under Widget type, choose Radial gauge. The radial settings appear:
Min value and Max value — the two ends of the dial's scale. Min must be strictly less than Max.
Tick marks — how many marks divide the scale around the dial.
Sweep angle — how far the dial sweeps, in degrees from 0 to 360. The default is 300, which leaves a gap at the bottom like a classic instrument; raise it toward 360 for a full ring, or lower it for a tighter arc.
Radial Gauge name — a short label shown with the dial (pre-filled from the metric, editable).
Toggle Display data legend if you want the metric listed, then click Save.
The dial appears with the needle at the current reading, the condition arcs behind it, and tick marks around the scale — updating as the sensor reports.
Worked example
Compressor discharge pressure. A compressor rated to 10 bar gets a Radial Gauge scaled Min value 0, Max value 10, with Tick marks 10 and the default Sweep angle 300. Three condition arcs give it instant meaning: "Normal" From 0 To 7 green, "High warning" From 7 To 9 yellow, "Critical" From 9 To 10 red. On the operations screen the needle sits in the green during normal running and swings toward the red arc as pressure climbs — a glance tells the shift whether the machine is where it should be. To raise a notification on a crossing rather than just show it, pair the widget with an Alarm.
See also
Last Data Widget — Full setup reference and the other display types
Gauge Display — The horizontal-track alternative
Conditions — Numeric From/To rules that become the dial's arcs
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