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not 100% clear on autodata to be honest but it "looks" to be pin 7, white blue (or white) this comes from the ecu and goes to the clocks, it also goes to a gearbox ecu for automatics, so it seems to make sence!
If it was me i would pin it out from the input on the actual clocks from the plug to the actual rev counter itself.
I have the 12v pulse wire from the omex, should I scotch it on each cable of the back of the clocks and see which runs the tacho? Or will that melt the omex? lol
Im pretty sure the wire colour changes after the bulkhead connection
if it was me i would work with pin 7 being the taco input to the clocks, my diagram is different to that of mattjk tho, what year did you select?
ben yes the wire does change colour at the bulk head, the wire colour at the clocks is white/blue or in a few cases it can be white. see what colour it is on pin 7.
TYhat diagram you have of the back of the clocks seems to be the led lighting for them.
Do you have a multimeter that has a continuity(spelling?) tester on it? if so put one end on the pin 7 and then try the solder joints arounf the tacho, see which one beeps thru.