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High Resistance or 'Open"
corrosion under the rivet holding the male terminal lug to the sender is seen as an 'open' hence your reading stays the same wire on; wire of the sender.
It is difficult to reestablish a good electrical connection without drilling out the old rivet, cleaning everything with 400 grt and going back with screw and nut.
Restringing that 'bow' is no east task. Try first wiggling the male terminal lug a lot (I though spraying gold chloride on the connections might help but it costs too much.) I fixed one onetime by taking a small (new, clean, sharp) jeweler's file: I wedged it into the gap on the underside and broke the tip off (1/16") off and left it there. hmmm
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