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 - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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