Edited: another fuel/temp gauge thread, but turns out the harness is melted together

Dubob said
Volt ohm meter to temp sender wire to ground. At the sender end. Should see approximately 5 volts dc fluctuating. Digital meter may not pick it up. If that’s good try a temporary ground to metal part of instrument cluster. I’d personally try the ground anyway.
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^^^ This is a good place to start^^^^

Page 8-48 in your FSM wink-gif.gif
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If it passes that, then go on to the next checks