ok so today i decided im going to swap out my cluster lights with LED's. I also decided to wire up a different tach. I've attached an image, what im wondering is which ones are which(the metal tabs that my old tach plugged into). i need to know which one is the ignition switch, and which one goes to the distributor to actually measure the RPM's.



thanks, Mike

 

on the plug behind the gauges it will be the white wire on the right side, and just use a voltmeter on the wires while the key is on whichever wire gives you 13-14volts is the power wire.