YES this is where I would start ALONG WITH A MANUAL PRESSURE TEST if Sending unit doesnt and Pressure test is GOOD ,Replace the Meter in Insrtament Cluster
I Have Pics but they will not show up in FixYa
The Oil Pressure sensor is on the Back of engine Looks like Left side 3 wire plug on 4.8L 5.3L 6.0L Can Email Pic with your Address
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You may have a bad guage. To check, ground out the sender by placing a screwdriver or alligator clips accross the ground tab and the center positive terninal. If the guage works you would normally expect a sender problem, but since you put on a new sender (assuming it's wired correctly [ no offense ]) you will need to trace t the wires from the guage to the SU. The fuel guage power lead is pink ( or at least it is on boats ) Look for a bad connection, corrosion, frayed wires or anything else that looks abnormal. You may want to simply replace the existing wire temporarily with another wire. This new wire should tell you immediately if your guage is bad. Good luck!
Normal oil pressure at operating temperature should be around 40 lbs, 30 at an idle. Either you have a bad oil pressure sending unit or you actually have low oil pressure that indicates a serious engine problem.
IF you have already checked the actual oil pressure with a test guage and you have already replaced sending unit(sensor), you may a have a malfunctioning guage(GM had a problem with instrument panel, gauges, for these years. You can check the tan and white wire at sender for 5volts, if thats good, you can ohm black wire and white wire to pcm, if thats good, recommend getting access to a good scanner and comparing guage read out to actual pcm data oil pressure.
need to hook a oil pressure gauge (tool) to it to actually see if it is running that high. if it is then if its a high mileage engine put a can of sea foam in the engine oil and run for 500-1000 miles. then change it and see where it gets you. pressure is resistance to flow. the only thing to cause it to get that high is tight oil clearances or a restricition in engine. this is a cheap try it solution. if the tool does not read that high replace the oil sending unit.
It is quite possible that the Oil pressure guage is faulty or else with a zero reading of the oil pressure the engine would have packed out. So removing the valve door will confirm if there is oil flow and confirm the guage. You can also remove the line to the guage and connect the line to a bottle, when the engine starts up the oil pressure will be displayed with a good pressure spray.... but be careful not be spray it all over with a loose joint.
Whats the make and model? Depending on what you are driving it sounds like either your oil filter is plugged up and you need an iol change, you have oil that is too thick in there, too much oil, or possably a clog in the oil pump or paths running to and from that area
You may have a Faulty Oil Pressure Sender.
Here are some reason why your guage is bouncing:
Corrosion or faulty electrical connections
If the oil pressure gauge is pegged low after the engine is running, or is pegged high after the engine is running, or if there is intermittent illumination of an oil pressure indicator light, the sender could be faulty
You can find the oil sensor on the left hand side near the Oil Filter, as long as you don't hear your lifters ticking and making lots of noise. it's not your oil pump failing.
Good luck and hope this helps
YOU SEEM TO BE ON THE RIGHT TRACK. I WOULD START WITH THE SENDING UNITS. GM LOVES TO PUT TWO OF THE ON A CAR. ONE FOR THE GUAGE AND ONE FOR THE DASH LIGHT. UNLESS YOU HAVE NOTICED ANY BIG CHANGES IN OIL PRESSURE I WOULD THINK IT IS THE SENDER(SWITCH) FOR THE LIGHT. THEY ARE NORMALLY LOCATED AROUND THE AREA OF THE OIL FILTER HOUSING.