ok i picked up a autometer sport comp 5 in tach. i got it used so naturally it didnt come with any instructions, and i just need to know what wires do what. theres a red wire, a green wire, a black wire, and a white wire. theres also some smaller wires 2 light blue and 2 brown. im thinking maybe the smaller wires are for the 4 or 8 cylinder setting? right now the two brown are hooked together and the 2 blue are not. so what wires do what? anyone have the instructions?