all parts are replace able.
The gauge can be replaced.
The most common problem is the sending unit. I have tried to get a Temp-to-resistance table for the gauge but have never gotten much.
The sending unit is located on the right side of the valve cover on the block close to the fire wall. There is a single wire connector comming out... thats it. its a few bucks to replace.
you could get a low resistance potentiometer and adjust the resistance so it acts like the sending unit and see if the gauge changes.
Or if you already have the sending unit get a cup of hot water (or cold if the motor is hot) and pull the connector connect it to the new sender unit and put it in the water in the cup. you will have to ground the sending unit. but if it changes then you know the gauge is working if not then its the gauge...
NAXJA Member #2619
1995 Jeep Sport Cherokee 4x4 with an Auto and 4.0L
B&M Transmission Cooler and Autometer Tranny Temp Gauge, Ruff Stuff Diff Cover on D30.
Taraflex 1.5" BB (rear shackle only), HD Quadratec leaf springs, RE 3.5" front springs, OME Long shocks, JKS Adjustable Track Bar from K.O.R.
Daystar Control Arm Bushings, Bushwhacker Flairs, Rhino lining along bottom trim, AGR PS pump with Cooler & Filter.
Bored TB, APN Manifold, New Downpipe, Magnaflow High Flow Cat, Flowmaster Super 44.
Dual Oil Relocation Kit running two K&N301 size filters, Autometer Digital Cobalt Oil Temp and Oil Pressure Gauge.