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You should be looking for dead spots, places where there's an open connection instead of an ohm reading.
Very good point to make. Lacking a meter with a real needle, 12V and a small (dash or glovebox) light bulb will reveal the lapses in continuity as the rheostat is moved through the range. Some digital meters provide a continuity beeper that works well for this purpose, but I can't speak for all of them.
Interesting to learn in this thread the 240's predecessor used a sender with opposite motion -- decreasing resistance as the fuel level declines.
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Art Benstein near Baltimore
"Never answer an anonymous letter." -Yogi
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