Hi NicolasR,

Please take a look at this article and try to create an idea about the WebGauge.

http://help.infragistics.com/NetAdvantage/ASPNET/2010.3/CLR4.0/?page=WebGauge_Web_Creating_a_Radial_WebGauge_Using_Code.html

After creating the base objects needed, you can initialize the properties of the "Needle Marker" as mentioned in step 11:

In C#:

mySolidFillBrushElement2.Color = System.Drawing.Color.Red;
myNeedle.BrushElement = mySolidFillBrushElement2;
myNeedle.AllowDrag = true;
myNeedle.EndExtent = 65;
myNeedle.EndWidth = 1;
myNeedle.MidExtent = 0;
myNeedle.MidWidth = 3;
myNeedle.Precision = 1;
myNeedle.StartExtent = -20;
myNeedle.StartWidth = 3;
myNeedle.Value = 95;
myNeedle.WidthMeasure = Measure.Percent;

Hope that helps,
Deni