Pressure Indicator is any instrument that indicates pressure. Pressure Gauge is also a type of pressure Indicator. It is a mechanical device. Pressure indicators can work on mechanical deflection (in case of pressure gauge) or Piezo electric effect, change in capacitance, change in inductance etc. These are generally digital type instruments.
Test with a mechanical gauge to accurately detemine oil pressure Could just be a defective oil pressure sensor
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.
mechanical
"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.
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 gauge should be electrical.
Your pressure gauge may be broken....If it fluctuates, then you know its not your gauge, but if your gauge always reads 80, it may need to be replaced.
Instruments.
You will need to remove your oil pressure sending unit and install a mechanical gauge to get a true reading. You need to start out cold and write down the pressure reading and also once it warms up to operating temperature. If the pressure gauge is not the same as the mechanical one you have a bad pressure switch.
Yes you can but, I would advise adding the mechanical gauge to the system but leaving the original intact.
Remove oil sending unit and replace with a mechanical gauge