If it's like my 88, then the problems probably in the sender ... and that's inside the fuel tank.
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Which Sensor are you refering too?
start with wires
how do you fix a gas guage on a 1989 ford aerostar
2000 ford lightning. P1540,po171.po174
Fix the engine
To fix a fuel gauge stuck on full in a 1993 Ford F-150, first check the fuel level sender in the fuel tank; it may be faulty or have a stuck float. Inspect the wiring and connections to ensure there are no shorts or corrosion affecting the gauge. If the sender is working properly, the issue might be with the gauge itself or the voltage regulator. Replacing the faulty component should resolve the issue.
temp gauge is stuck on hot