You need to find the oil pressure sending unit. it is usualy on the back side of the engen or by the oil filter. you will see a plug with one wire coming off of it. the oil gauge you have should of come with a tee that you can put the oil sening unit in to sow the oil light will go off.
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Oil pressure can be checked at the sending unit passage with an externally mounted mechanical oil pressure gauge. To get accurate results from the test, make sure you follow the manufacturer's recommendations and compare your findings to specifications. Testing the Oil Pressure Gauge
Test the gauge by grounding the wire that leads to the sending unit on the block.
When the wire is disconnected from the sending unit with the key switch on, the needle on the oil pressure gauge should be either all the way high or all the way low. Grounding the wire should make the needle move to the opposite side of the gauge from where it was before the wire was grounded. If the vehicle is equipped with an oil pressure light, touching the wire to ground and then removing the wire from ground should turn the light on and off.
If either happens, the gauge and wiring are good and the sending unit is at fault.
Testing Oil Pressure
Pressure can be tested by temporarily installing an oil pressure gauge in place of the sending unit. Before testing, look up the oil pressure specifications for your vehicle in the appropriate service manual.
Bring the engine up to operating temperature.
Now shut the engine off.
Locate the oil pressure sending unit; usually it is on the lower side of the engine block.
Disconnect the wire from the sending unit and use an open ended wrench to remove the sender. Using pliers can damage the unit.
An oil pressure sending unit is removed with a special socket. Courtesy of Chrysler Corporation.
Tighten the oil pressure test gauge into the hole in the block where the sender was removed.
Measuring oil pressure. Reprinted with permission.
Check the engine's oil level and fill, if required.
Be extremely careful when working near a running engine. Always wear safety goggles or glasses with side shields when working around moving machinery and be sure that your clothing is not loose.
Now turn the engine on and check the oil pressure on the gauge.
Watch as the engine warms to note any excessive drops due to temperature.
Make sure the engine speed is set to specifications for testing pressure.
If necessary, us a tachometer and adjust the engine idle speed.
Record the measured oil pressure, then turn off the engine.
Compare the test results with the manufacturer's specifications.
If the oil pressure is within specifications, this shows that the oil pressure sending unit may not be working correctly.
In many cases, replacing the oil sending unit will correct the problem.
After the test is complete, reinstall the oil pressure sending unit, start the engine, and confirm there are no leaks.
The oil sending unit is located on the engine block behind the drivers cylinder head area.You have to climb up on the motor to see it cause it is hard to see behind the wiring harness.You may also want to purchase a new sending unit because it is very long and you might need to buy the sending unit socket to replace it.Hope this helps.Good luck.
My guess would be you have a faulty OP sending unit,purdy common on GM!! There are actually 2 sending units,1 controls the gauge and the other go's through the ECM and will shut down the fuel pump if there isn't enough oil pressure! You can or have a mechanic put a manual gauge on it and see what the OP really is running, If it has good OP then,install a new sending unit and Ride that Ride with a Smile!
If the engine is not making any noise.It is probably the oil sending unit that is defective.If you want to be sure you will have to install a pressure gauge and check the pressure when the vehicle is at normal operating temperature.If it is above 10 psi then replace the sending unit.It is located on the back of the motor on the block by the left cylinder head.You might need a special socket for it.Hope this helps.Good luck.
remove the oil sending unit and install a oil pressure gauge.You did not specify the motor so you can find it by the oil filter.remove the oil sending unit and install the gauge.Let the motor get to operating temperature and check pressure.Should be @ idle over 5 psi.5 is minimum.@ 3000 rpm should be 45-105.Hope this helps.Good luck.
The oil pressure sending unit is a sensor with an internal diaphragm, if the internal diaphragm is damaged , or the line to the diaphragm is blocked you can get this kind of fluctuation on the oil pressure gauge.
The oil pressure value must be read by installing a mechanical gauge near to the oil pressure switch and checking the pressure.
If pressure is ok, replace the sending unit. If there is a real pressure drop, check the oil pump.
If you still get fluctualtion after replacing the oil pressure sending unit, replace the oil pressure gauge.