It has the same black, red & orange as the boost gauge which I've wired up (headlight switch). Gauge illuminates but I'm confused about the remaining 3 wires, black, red and green I think. Green I assume goes to the sender but why do I have another red and black? Can I put this black in with the other earth? What about the other red, 12v I assume but I'm guessing I can't take it off the headlight switch as it'll be dimmed right? Confuzzled Dom.