Is your tacho an external shiftlight version? And the instructions cover both non-shift light and shift light versions? So perhaps could the yellow be the shiftlight bulb power source? Or possibly is there a push-button replay model in the range?
The red/black/green all seems in order - I don't see why you'd need a permanent hot wire, except maybe for a internal replay memory.
Hi Mark, yes External Shift Light, but that has it's own red/black twin flex with unique plugs. I think the little battery pod is to hold the tell tale maximum revs Recall and to hold the shift light memory? It also has the 7 light colours wank factor
Both pages refer to the shift light, but only one page refers to the non existent yellow wire
mate u will have dramas with spiking with that tacho, not worth the box it came in.....
Hey Cheder, maybe that's why Autotecnica haven't responded and why I got it so cheap
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I'll have another play with it today and will call Autotechnica tomorrow... Otherwise they can swap the tacho for a passenger race seat