A good diagram is half the battle. Did you merge one yourself or find one on ratsun? I remember there was a nice color coded 11x17 version of a stock 510 wiring diagram this guy Paolo on the bluebirds mailing list used to sell that should be floating around on the web. Having wire colors is nice.

I have a couple of Paolo's diagrams but the part I am currently on is all Z32 engine wiring. I have a good Z32 diagram and just blanked out the stuff the 510 doesn't use.