question for tach guru\'s i have a tach that i want to mount in my truck, but i dont know what wires go where. The tach is a SW stage 1. i dont know if anybody has heard of it before. there are four wires coming out of the back, 1 red, 1 green, and 2 black. if anyone can held me or point me somewhere to where i can find out, i would be greatly apreciative. thanks alot. sam.