To check the gas gauge signal from the dash go to the trunk, pull up the carpet and look on left side for a black connector with 2 wires.Check the voltage by using a voltmeter to the colored one and ground the neg vm wire and it should read 10v min.
Dash speedo is not a big hassle to open the gas gauge is an easy check. If the gauge is ok then go back to the trunk and check the wiring at the in tank pump. Open the silver panel next to the wires you checked before and check the wiring that passes thru the top of the plate going into the tank. If its been in a rust environment there is a chance the wiring that is encased in the plastic pass thru sleeve is corroded or broken and you need a new sender assembly ($80 from FCP Groton) or you need to fix the wiring (if you are mech minded).
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