The gauge should be electrical.
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.
Yes , there was a mechanical gauge cluster and a mechanical gauge cluster with tachometer - but I'm sorry I don't know if they can be interchanged
with a fuel pressure gauge
Audi A4 1999 1.9TDi Oil pressure light on continously. Engine sounds fine. How do I remove electrical connector to remove switch and check pressure with a gauge?
Instruments.
On a 1996 Ford Crown Victoria : The H / L ( High / Low ) gauge : On the drivers side of the speedometer is the battery voltage gauge On the passenger side of the speedometer is the engine oil pressure gauge
Your check gauge light comes on if : your coolant temperature guage shows the temperature is high your oil pressure gauge shows the oil pressure is low or your fuel gauge shows the fuel tank is near empty
With this kind of question you need to check for electrical problems. Hook up a manual gauge and see it you have the same readings. If so you have internal engine problems. If not it's electrical.
Check engine light : Gauge cluster without tachometer ( under the engine oil pressure gauge ) Gauge cluster with tachometer ( just to the left of the battery voltage gauge )
On the engine there is a test port located on the fuel rail. A fuel pressure gauge can be attached to it. A test gauge can be purchsed from your local auto parts store. With gauge attached, cycle ignition key on and off several times. Fuel pressure should peak between 41 and 47 psi.
Could be low on coolant or a faulty thermostat.
The plug or sensor above the oil filter on a 1996 Cherokee is the oil pressure sending unit. This sensor controls the oil pressure gauge.