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Did you say you saw battery voltage on the wire going to the sensor with it unplugged? Voltage on the sensor wire with it unplugged would rule out a short to ground between the sensor and the gauge.
I should say the jeep trouble shooting book was for 1988, I believe Jeff/Alaska has a 1989. I think the difference will be slight.
He did say he cleaned out his bulkhead connector before, maybe there is a issue there.
Lawsoncl,
Yes there is full battery voltage at the sensor wire. Tested both on RUN/OFF and RUNNING. No difference full voltage at the sensor wire. At this point I am thinking that there is a bad connection to the gauge cluster, but not likely since ALL the other gauges are working but most likely is the gauge failed and suddenly.
Update: After testing the ground, sensor and ignition source wires I determined that had a non working gauge. There are two resistors on the gauge, one 75 ohms tested at 42 and 5 ohms tested at 5. Replaced the 75 ohm with no luck. Found a OEM new in box gauge on Ebay all is good now and working. Thanks for everyone's advise and your input.