Temp & fuel gauges - what am I overlooking?

RedFish said

Cases like yours are rare. Some of us look forward to a challenge. Learning the solution to your puzzle could benefit someone else. I for one would be quite disappointed if you gave up.

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I would really like to drive the thing this weekend if possible.

I've got the tester to slap together today, and if things check out with that I don't think there's a reason to keep the cluster on the bench.