The gauge on my 940 was 'whack to read' for ages. I had checked out the wiring and the flexi-circuit on the back of the cluster to no avail.
Eventually I got so fed up with it that I delved further: There is a small pcb inside the gauge itself, behind the metal cover. There was a dry solder joint on this. Re-soldered all the joints on that board and it was fine after that...
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