Disconnect the tank sender, use a 12v testlight. Probe the wire and ground the clip to a known good ground. Key on, the testlight should "glow" and the gauge read about 1/2 scale. That proves the gauge itself and the wiring. Old time dealer mechanic trick. Any GM electrical gauge= water, oil, fuel can be quickly tested like that.
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Why is it all the technology looking for intelligent life is pointing AWAY from Earth?
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