Most fuel level senders that I've seen go to ground inside the sender. One way to test it is simply to put a jumper on the lead from gauge to ground and see how the gauge responds. If the gauge responds then the sender is bad, if not then there is a problem either in the wire to the sender or the gauge or the power to the gauge which can be checked with a voltmeter starting at the fuse.
Jon
77 coach, Civic toad
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Jon and Alie Kabbe
Started with 77 Coach
Now have 39' 93 coach
2007 civic toad
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