@williamatics Usually the dashboards are quite flat so I wouldn’t place any buttons or screens in a curved area. For a tank, let’s look at this image:

You can see that despite the globally curved interior, all the instruments panels are on flat surfaces. My advice would be for you to create boxes on which to place all these instruments. You can then add cables between boxes and some attachment brackets for added realism.
Forget about the displacement map, it’s not a good idea 🙂 To answer you question, it will not distort the polygon if you use microdisplacement, but again, it’s not a good idea for a dahsboard I shouldn’t have bring that idea up.