If I remember right the board is behind that area and would have to be modded.
The only reason I remember that is because I replaced all three of those factory guages with white faced aftermarket ones (using the factory holes), so I had it apart and made mods to the back panel to do it.
Nope, I'm wrong.
The metal of the housing is there and not the board.
This is where you could cut the tach in.