Wow, someone else backwards enough to MAME a Pole Position cabinet.
I did mine with the original 360 wheel and it was fine for 360 games and the others were playable with some serious adjustments. I put function buttons on the back of the dash top, on the monitor side, easy to reach, but kept that authentic look. Also converted the pedal to a microswitch, cause I'm lazy, and getting the pots to work was a complicated procedure. The real trouble part was the shifter, since it acts like one button, it wasn't very useful.
In the end, I got tired of it, and built a fighter panel, and I'm rebuilding the wheel panel so I can use a newer wheel/shifter setup I got off of a PolePos converted into a World Rally I snagged for free in a badly swollen cabinet. It's not "authentic" anymore, but I have alot more fun that just being able to play a dozen racing games.