Trying to use custom Linear Gauge Indictor Background Images
Workaround
While the gauge does not support custom indicator shapes currently, you can work around the issue by utilizing the Rectangle indicator type, removing its background color, and using a background image with the desired shape.
Still, this alternative is limited as the background images cannot scale to the size of the indicator and the image used will need to have the exact size for the current gauge.
Bug
The XML Serializer cannot resolve type with name System.Drawing.Image Invalid cast from 'System.String' to 'System.Drawing.Image' (screenshots attached)