Dave Ett wrote:It's electric, and has three wires. A power, an earth and a signal from the PGM unit.

You making a race loom or something?

I have an HRC loom on there with HRC ignition (PGM F3 from the RS I believe!), but the rev counter is not working. I know there is power going to the temp gauge cause that works, but I'll need to trace the rev counter wires back. Do you know what colours are + - and to PGM?

I'm going to make up a seperate lights and indicator loom as the HRC one doesn't have any of that.