I have a stock tach without the factory wiring so the colors of the wire are different . I do have a sender wire running from the distributor that works. And I do have a 12v wire. And I know that there HAS to be a ground somehwhere.. Now how do I wire it to the tach. I only see two terminals on the back of the tach. Obviously one of them is for the sender wire.. which one? And what is the other one for ? Is it for the ground or the 12v. If it is for the 12v then where does the tach receive its ground from ?
