Do you have a multimeter? If so, pull the sending unit from the tank, and measure the resistance with the float all the way up (full tank), and all the way down (empty tank). That is the best way of knowing for sure exactly which gauge you need.
This is from the FSM for my 04 4.0L:
NOTE: For diagnostic purposes,
this 12V power source can only be verified
with the circuit opened (fuel pump module
electrical connector unplugged). With the connectors
plugged, output voltages will vary from
about 0.6 volts at FULL, to about 8.6 volts at
EMPTY (about 8.6 volts at EMPTY for Jeep
models, and about 7.0 volts at EMPTY for
Dodge Truck models).
2006 TJ X (Stock - w/ Borla Cat-Back Exhaust)
Built a YJ from the ground up:
- '04 4.0L (4,000 miles), NV3550 (0 miles), NP231 w/ HD SYE (9,000 miles), 33x12.50x15 Pro-Comp AT's, HP D30/8.8 (4.56 gears), ARB Lockers front and rear w/ compressor, hard/soft tops, full/half doors.
-----> Build thread can be read here:
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