Hi there,
Having a lot of dramas trying to get my tacho working, ready to pull my hair out.
I have an 89 GQ that had a TB42 in it but was converted to a 1993 TD42 not long before I bought it.
I have searched a few forums & tried all the suggestions that I could find but still to no avail.
Here's where I'm at -
Have installed the tacho gauge from a 96 TD42 into the 89 TB cluster. I noticed the 96 gauge has 3 securing screws instead of the 4 that are in the 89 cluster. The 'D TAM' screw is missing from the 96 gauge. Is that going to present problems? Is the 96 gauge compatible with the 89 wiring? I would assume the 96 gauge is updated from the 89 cluster as it has white font & graduations instead of the yellow from the 89.
There are a blue wire & a green wire coming from the timing cover mounted tacho sensor. I have earthed these both (not at the same time though) & run a bridging wire from the remaining tacho sensor wire to the yellow/black trace wire that goes into the cluster with no results other than swearing from me.
If there is someone out there that has first hand knowledge of how I can rectify this I would love to hear from you please.
Thanks Jaz.