Hi Andybob, Have you got the handbook? At the back,there is wiring diagramsif you look here, you will see where the wires go. I can,t remember off the top of my head but i think there is only 1 wire to the rev counter itself. The others are for the clock and lighting. I fitted one to mine years ago. If you need any further help please get in touch. Regards moon rover! :idea: