rustyfarmall, Your 1980 Ford Fiesta probably had the old oil gauge that did show the differences in pressure. At some point back there Ford changed the oil gauge indicator to an on -off switch. Here is what the manual says about one setup. When the engine oil pressure is normal, the oil pressure switch is closed (short circuit), allowing current flow through the 20-ohm resistor on the cluster flexible circuit into the gauge which drives the pointer to a position slightly above midscale. The switch opens (open circuit) when oil pressure drops to a critically low level (4.5 - 7.5 psi) causing movement of the pointer to or below the "L" band
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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