If yours is like my 91 F150(4.9L six), that gage really isn't a gage. It's more like a mechanical idiot light, either off or on. It doesn't really show pressure, and the sending unit is just an off-on grounding type switch. It was the first truck I ever had that didn't show a little lower oil pressure when idling hot. I finally got curious enough to check into it.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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