Join Date: Mar 2000
Location: Moab, Utah
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Re: Temperature Gauge 4.0L........????
The 1990 4.0l I used came from a Cherokee, a non-HO setup. I bought the harness and necessary sensors/throttle body from HESCO, basically a MPI kit without the manifold. On my engine, the sensor in the t-stat housing is the CTS (coolant temp sensor) for the injection, it has nothing to do with the temp gauge. I know the later 4.0l (95? and up) use a updated system with the dash/gauges/charging system integrated with the computer, I don't know anything about them. The stock sensor for the stock 80's CJ gauges is in the head, drivers side, top rear as is the one for my 4.0l. It is small and not easily seen. I wanted an actual temp gauge so that's why I went with an aftermarket gauge. If you have a newer 4.0l, they may not have a place in the head for a temp sender, I have never looked at a newer engine. HESCO does have an inline fitting you could put into the heater hose from the t-stat housing if you went that way. I think it's made by Four Seasons and you may be able to find it at an auto parts store. The sensor in the intake manifold is the MAT (Manifold Air Temp, at least on my engine). I'm sorry for rambling, this may not have anything to do with your setup.