Kevin,
Could it be somewhere in the suspension? The spring bushings or the springs themselves squeaking as they move in use going down the road?
You can do a quick check of the gauge and interconnect wire by grounding the gauge wire at the sender end -- or if the tank is already in position again there should be an inline connector in the trunk between the body loom and where the wire exits the hole in the rear panel to go under to the tank. You can access all but about 3' of the wire at the connector for measurement or grounding.
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