Drawing over Gauge

I want to draw (with code like System.Drawing, etc.) a dynamic polygon responsive to pitch & bank values over the top of an invisible created gauge or else a gauge that I don't have access to the code for. Are there handles that I would need for such a drawing space? The way the SDK example gauges are set up, I don't think the design of this dynamic polygon could be created. It is created in C# and could be converted to C for callback functions within a gauge, but I don't know how to write over the MSFS environment. Thanks for any help!