Your problem might be solved by using the standard P3D heading indicator.
Try following change in the panel.cfg:
[Vcockpit01]
...
//gauge06=DeHavilland_Beaver_DHC2!dg , 116,119,108,108
gauge06=Cessna!Heading_Indicator, 116,119,108,108
BTW:
The Aerosoft Beaver is about 10 years old now (or more) and the flight dynamics/FDE are totally outdated and far away from realistic!!!
Did you ever fly an A2A aircraft like a Cessna or a Commanche, then you will know what I mean. You have to take care of engine managment and many other aspects of flying.
So why not trying the MilViz DHC-2 Beaver when there is a special cheap selling at MilViz.