Citroen Relay, Peugeot Boxer 2003 2.2 turbo - Citroen relay/Peugeot Boxer wiring diagram anyone? - Citroen Surf Bus

Pssst, anyone have access to the vault in the Pentagon where the wiring diagrams are kept?

I have a speedo problem I can't fix because I can't identify the 3 wires on the gearbox sensor. (Need to find the earth wire.)

I'm stumped without it!