I have a my97 turbo and have just bought a second hand blitz id meter to fit to it, it has 3 wires a live an earth and one other wire which connects to the speed sender unit on the gearbox, as far as i can see their are a couple of wires on the sender can anyone tell me which one i connect to?

 

c'mon everyone their must be someone out there that has fitted one of these.

 

?????