You can use the C1RadialGauge control's C1Gauge.Min, C1Gauge.Max, and C1Gauge.Value properties to specify the available range and the selected value in that range:

The C1Gauge.Min and C1Gauge.Max properties specify the range of values the gauge is designed to show. For example, a thermometer may have a scale ranging from -40 to 100 degrees, and a speedometer may have range of 0 to 140 miles per hour. The range is specified through the C1Gauge.Min and C1Gauge.Max properties (of type double). The default range for a C1RadialGauge control is from 0 to 100.

The C1Gauge.Value property indicates the current value of the gauge. In the C1RadialGauge control, this is indicated visually by the value the C1Gauge.Pointer element is pointing to. The default C1Gauge.Value for a C1RadialGauge control is 0.