what happens if you ground it out it when its acting funny? since you would have zero ohms it should read below E. also what happens when you unhook the sending wire? pending on the gauge it should read past full.
also what do your test leads show ohm wise when you touch them together? i have seen them read as much as 20 ohms by them self when they should read zero ohms and that would be caused by bad leads or just a cheep DVM.
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