Need to have a look at this tonight again, sorted it the other day by messing around with all three of them, but I'm not sure which one is and the problem has come back again. Does anyone know which colour wires should connect into there, i presume it's not connected to all 3???
not critical but i kinda want to be more efficient by not messing around with the other wiring too much, and the ECU is seeing double RPM according the the secs monitor so i need to sort it out.

 

3rd one (passenger side)

 

rev counter is the green wire, and im sure it goes to the connector behind the battery

 

yep, its the one behind the battery

 

Cheers for the input, i fixed it last night, i do believe it was the 3rd multiplug- (one closet to passenger side), but i cleaned the middle one just to be sure, didn't have time to do the last one though but it seems ok as there are no other faults anyway. There are 3 multiplugs that are on the bulkhead, the BIG main ones, it was those i meant, sorry for any confusion.
The ecu must have been getting duff readings as my secs is wired into the loom there, and it was displaying double RPM which is also what the ECU would have seen, it's ok now though.
CHEERS!!!!