They are not marked, but as I said above they came in different ranges. You have to look at the part number stamped on the gauge (and hope that OEM got it right). If an oil pressure gage it shold show reduced pressure when idling as opposed to full rpm. If you have the correct gauge according to the part number on the gauge and it does not move at all, then and only then will I blame the gauge. I do have a non colored oil pressure gauge on an H that does that. It is definitely either not working right or the wrong range.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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