Radial Gauge widget
The widget displays a pointer value in a graphical format between a minimum and maximum value. The pointer indicates the selected value on the gauge by color code.
The gauge also allows for colored ranges to be added. Each range can have a different color allowing for meaning to be inferred from them. These ranges could indicate targets. A common example would be to show the results of a process parameter, when under the lower spec limit, show as blue, when between the lower spec limit and the upper spec limit show as green, when above the upper spec limit show as red.
The Unit is the number to display unit markers for. If omitted no ticks or labels will be shown. Can be a context that resolves to a number.