I recently swapped a full instrument cluster into my 88' Comanche. It's nice to have gauges rather than warning lights, but I question the oil pressure reading. According to the gauge the engine has 60 psi of oil pressure at cold idle and running. When up to temperature, about 210, the gauge will drop to about 30 psi but that still seems high. I like to think that this engine is capable of that kind of oil pressure but with 183K miles on a 4.0L, it doesn't seem likely to me. The cluster came out of a 90' model Cherokee and the sender is new.
I invite your comments.