Lockheed Martin offers us Prepar3D v4 and v5 now native for 64-bit systems and VR compatible. Prepar3D engages users in immersive training through realistic environments. Ideal for commercial, academic, professional, or military instruction.
You are going to have to have a little patience with P3D V4 issues. There is a good chance it wont get fixed though, so I would try replacing the gauge in the panel config with one from a plane that does work (assuming it is roughly the same size).