[1998IsuzuRodeoS]

turned ignition on 10 minutes and gauge stayed on cold first wide line.
I will check those resistance value. I expect they will be okay since this is third temp sending unit from three different auto parts and three different brands.
My next procedure will be to run a test wire from temperature sending unit to gauge bypassing the factory wire. Just to test.

 

[mudoilngears]

If the gauge stayed cold with the ignition on, and sender disconected, the problem is not in the wiring.

 

[Amigo_Guy]

ABS is next project. I read about a known ABS wiring issue near rear of the vehicle, which I will diagnose. I just had computer updated bu Par-Tech for fuel gauge update, and I just filled up the gas tank. Before the update, the fuel gauge was reading near empty after filling up the fuel tank.

The concern is the temperature gauge. Can the temperature gauge be replaced without replacing the entire instrument cluster?

I am having fuel low issues as well, did the par-tech pcm update work well? I was thinking of doing it but wasn't sure if it would work.

 

[TexasGold]

Did we ever figure this one out?