Leaning towards bad gauge unless you hook sender backwards or insufficient/wrong power, ground or ohmage. To the bench with you. Just because you wired to "key hot" does not mean you are getting hot to gauge terminal.
Troubleshooting
Rule 1. NOTHING is assumed.
Rule 1a: NOTHING.
Rule 1b: Read rule 1 and 1a.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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