Tachometer GQ 1997 TD42

[Patricapatrol]

For the last few years intermittently the tacho/Speedo decide to take a break and have a rest usually in the 0 engine off place. Well after a Easter trip out west the tacho decide to have a rest over in the redline zone. Speedo still working well. Question is any ideas?

[mudnut]

For the last few years intermittently the tacho/Speedo decide to take a break and have a rest usually in the 0 engine off place. Well after a Easter trip out west the tacho decide to have a rest over in the redline zone. Speedo still working well. Question is any ideas?

Probably too late for a reply but it might benefit others.

I have experimented with GQ tachos and speedo on a test bench. I have found that with the needle reading over halfway and the power supply is interrupted momentarily, it will start reading in "reverse".

With the motor running, use the handle of a screwdriver to tap the wiring loom, fuses and connectors. If no fault presents itself, you may have to pull out the cluster and check the tacho circuit board.

[Patricapatrol]

Thanks for the reply, did what you said. Hit stuff. Nothing, so pulled the dash cluster out and pulled front glass off (needed a clean anyway) dust gets in everywhere. Moved needle back to zero. If it’s not wanting to work, looks better at 0 and not past 6000rpm. Plugged everything back in and started car. Guess what , it works. Seems the plug into the back may be the issue so will support plug harness with a zip tie.
Thanks Mudnut
HAPPY DAYS😁