Did you by chance test the gauge with a resistor? If you haven't you may want to try picking up some 10 ohm resistors from Radio Shack or some place similar, and then test the gauge from the back of the Jeep.
This isn't precise, but it's close. the idea here is to see if the gauge is at least moving using the existing wiring and the gauge.
A full tank equals 10 ohms.
1/2 tank equals 23 ohms
Empty equals 73 ohms.
20 & 70 ohms resistance will be close enough to watch the gauge needle move.
Ground out a 10 ohm resistor and touch it to the sender wire going to the gauge. You should have a gauge reading "full".
Now, string 2 resistors end to end (series) and re-test. You should get 1/2 full.
Same thing with 7 resistors, or whatever adding to approximately 70 ohms. You should get close to empty. You could also use a variable resistor and an ohm meter to set it. You get the idea... imitate a working sender to test the gauge.
The cool thing is you can do this to the temp gauge as well and you can do it without removing the gauges from the dash
I'd rather be lost on the trails than found at home!
Phoenix Rising- A Flame Off Restoration?
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