If you have the Clymer's Manual or the workshop manual, the wiring diagram is in the back of those. You could take the necessary components from that and transpose your own schematic. If you don't have either, I have the workshop manual and an owner's manual on PDF that you are more than welcome to. PM me if you are interested.
Before you decide to get rid of your gauges and what not, find out if your state requires any. There are laws in certain states that you have to have some way to monitor your speed, so make sure that you're in the clear. Otherwise, I'm keeping an eye out for 500/550 gauges, so let me know if/when you do get rid of them!