Hopefully this is an easy one for you guys. 7.4 Mercruiser..removed stock alternator (a few wires going to it )..replaced with a new one wire alternator. I'm running a new wire from "hot post" on alternator to the positive on the battery. Question is...what wires do I hook together from that harness, or connect somewhere else so that my voltage gauge works ? I wanna be able to visually see that its charging. Thanks guys.