I have a question on my DC (ammeter gauge. It is a 12v system. I neglected to mark the wires after removing them from the back of the gauge. I know not very smart of me. Anyway I have 5 wires coming from the following areas - one from the alternator, one from the solenoid, one from the headlight switch, one from the ignition key, and one from the fuse box. My question is which wires go to the positive post on the back of the gauge, and which wires go on the positive side of the gauge. thanks for your help. Robert