The tab is connected (I drilled the hole slightly so that it fits over one of the speedo clamps and thus make an earth for the device).
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For what it's worth, I've just been doing some testing on the workshop bench. I've found the resistances that make most sense, with a 10 volt stabilised supply attached are; Empty 220 Ohms, 1/4 120 Ohms, 1/2 68 Ohms, 3/4 42 Ohms and Full 22 Ohms. I also found my resistance wire in the sender unit had slipped down from where it should be, so was causing my massive under-reading error. I guess the resistance is non-linear due to the heating requirement of the bi-metal element in the gauge, whereby current would need to square to maintain linear heating?
Just a thought.
SteveComment
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