The game appears to have a bug with the instruments, however I have found a quick solution to get you back in control of your plane.
Solution
Resize any of the windows that are open on your screen (ATC, VFR MAP, CAMERA, etc.).
If you don’t have any windows open then just simply move your mouse to the top of the screen and select one of the menus, then try resizing the window by dragging its edge or corner.
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