Great stuff Paul, you're filling in gaps that should help resolve one of the 75/ZT's great mysteries, the wonky fuel gauge. It's clearly a relatively simple mechanism after all, but prone to the most odd behaviour. The slow needle response to rapid changes in the rheostat confirms the electronic damping imparted by the ECU to drive the gauge. This smooths out the sawtooth effect you'd otherwise get from the fuel sloshing around. What remains to be understood is what causes the float rheostats to give varying values when the fuel level isn't changing. I suspect the answer will be quite interesting.
TC
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