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Well gents. The problem seems much more clear now. I plumbed a manual pressure gauge and did some driving. Took a little more time as I gathered fittings so's I could have both the factory electric gauge and new manual gauge connected at once. After some highway driving, the dash gauge would...

I haven't made time to install the mechanical gauge, but just changing the oil to rotella 15w40 and a new filter has doubled the idling hot oil pressure. Funny what the right (or better) components will do. I will still put a new gauge in but so far things are definitely improving. I'm glad for...

On the suspicion that my HMMWV has less than perfect grounding, I went ahead and put on my homemade grounding harness last night. First thing I noticed digging around is that the ground lug above the fuel filter was loose. This is the ground lug that on the inside of the dash happens to...

DatGuyC, the fan is locked when the motor is off. It only seems to kick on high speed when the vehicle is moving though. I installed my grounding harness last night, and that included a ground to the EESS, so I will see how/if her behavior changes as I drive her. I took a 15m test drive...

Thanks gents, I appreciate the feedback. I can easily hook up a mechanical gauge, and happen to have more than half the setup handy from a motorcycle diagnosis project earlier this year. I am happy to change to 15W-40 RWH, especially considering the advice comes from you. I bought it by...

My 1987 M998 has been doing fine. We went to Graves Mountain and had a blast last month. Acted odd yesterday, so bear with me while I try to give you experts all the information I can... Coming home Sunday evening from TheCaptain's place, I noticed after a long haul (25 miles maybe) at...