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The oil pressure gauge in a 1999 Ford Explorer is ELECTRIC
A mechanical oil gauge may bounce if you are low on oil. An electric oil gauge may bounce if the sending unit or the gauge itself is faulty and of course you are low on oil.
Worn crankshaft bearings, oil pump, or a defective oil pressure sending unit. Have a oil pressure test done with a mechanical gauge, the electric gauge is not very accurate and is prone too failure.
The oil gauge shows the oil's temperature. The oil pressure gauge monitors the oil pressure for your viewing pleasure.
Connect the wiring harness to the back of your oil pressure gauge. Secure the oil pressure gauge with the retaining screws.
Bad oil pressure sending unit?
Defective gauge, defective oil pressure sending unit, low of oil, defective oil pump.
Six-year the oil pressure gauge for your 1999 Mitsubishi eclipse with the retaining screws. Connect the oil pressure gauge wiring harness.
Have you change the oil pressure sending unit, that's what I had to do. David
"T" into the existing oil pressure gauge with brass pipe fittings. This way you will have the original oil pressure gauge and the mechanical oil pressure gauge. Don't forget to use thread sealer.
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Most oil pressure gauges operate by a varying voltage. The oil pressure changes the resistance in the oil sensor, causing the gauge to change readings.