If the oil pressure gauge is not connected will the engine run?

1. Oil Pressure Gauge Not Working You will notice this happens when your oil pressure gauge is not reading, whether the engine is turned off, idle or running. Try to step on the gas to rev up the engine. If the oil pressure gauge still doesn't change its reading, your gauge is busted. It's best to replace it as soon as possible because you won't have any idea if your car is already overheating or not.
2. Oil Pressure Gauge Reading Too Low When your engine is idle, the oil pressure gauge will have a low reading. When the engine starts running or when you're already cruising or on the freeway, your gauge's reading should have increased. If it stays on a low reading, then you now your oil pressure gauge is broken.
3. Oil Pressure Gauge Reading Too High Another common oil pressure gauge problem is when your oil pressure gauge is reading too high when your engine is idle or when it's turned off. Rep

Do not drive the truck until the issue is resolved.

1. Make sure the oil is at the proper level in the engine with the correct spec oil for the pickup. Oh it is normal for the oil pressure to be a little low at idle and go up to the normal range as the engine rpm goes up to normal operating range.

2. It could be either a real problem or a problem with the oil pressure indicator. To verify which connect a mechanical test pressure gauge of the proper range say a 0-100 psig scale to the point where the oil pressure sensor is connected. After it is connected test run the engine for a short period. If the pressure shows normal replace the oil pressure sensor. If the gauge confirms the low oil pressure then you have a serious issue in the engine. It could be:

1. Bad oil pump or oil pressure relief valve

2. excessive clearance in the bearings due to high miles.

where the oil pressure sender unit is on the block install a "t" fitting . Place the electrical unit in one side and a brass fitting in the other . Run the copper line from the gauge through the firewall to the "T" piece and connect up (if you are using a plastic tube the do not waste your time as the plastic fails -cracks ,slips. or melts causing engine failure) Position the gauge and connect the copper line to the gauge . run engine and check for oil leaks.

you may have a faulty oil pressure sensor which needs replacing or a loose connection, check for any loose wires......hope this helps.....cheers.

I would suggest taking the oil pressure sender out and temporarily connecting a manual gauge to the engine. Run the engine until it's warm. If the manual gauge reads the same pressure as the electric one you may have a serious engine problem. If the manual gauge reads normal when the engine is warm the problem is probably with the gauge, most likely the sender.

Look for the oil pressure sending unit on the block or the cylinder head on the V-6 or V-8 models. --- OIL PRESSURE TEST Check for proper oil pressure at the sending unit passage with an externally mounted mechanical oil pressure gauge (as opposed to relying on a factory installed dash-mounted gauge). A tachometer may also be needed, as some specifications may require running the engine at a specific rpm.

1. With the engine cold, locate and remove the oil pressure sending unit.
2. Following the manufacturer's instructions, connect a mechanical oil pressure gauge and, if necessary, a tachometer to the engine.
3. Start the engine and allow it to idle.
4. Check the oil pressure reading when cold and record the number. You may need to run the engine at a specified rpm, so check the specifications.
5. Run the engine until normal operating temperature is reached (upper radiator hose will feel warm).
6. Check the oil pressure reading again with the engine hot and record the number. Turn the engine OFF.
7. Compare your hot oil pressure reading to specification. If the reading is low, check the cold pressure reading against the chart. If the cold pressure is well above the specification, and the hot reading was lower than the specification, you may have the wrong viscosity oil in the engine. Change the oil, making sure to use the proper grade and quantity, then repeat the test. Low oil pressure readings could be attributed to internal component wear, pump related problems, a low oil level, or oil viscosity that is too low. High oil pressure readings could be caused by an overfilled crankcase, too high of an oil viscosity or a faulty pressure relief valve.
   

Sounds like an electrical problem, make sure the ground leads to the engine are good and the battery terminals are clean. It might just be a bad connection in the wiring harness try jiggling the connections to see if it makes the gauges jump when it is running.

You need to verify that oil pressure is ok.
They sell gauge at the parts store which has to be connected to the engine block via oil pressure sender hole.
For that , take out oil pressure sender(unscrew) and screw the gauge in to the hole (con thread).Run the engine and see if pressure is ok at idle and on higher RPM.Gauge suppose to have scale (norm. , low , high ).If oil pressure within specs , repl. oil pressure sender.
Or just replace oil pressure sender and see if that helps.They are not expensive ~ $30.00 , gauge probably the same money.

I'm assuming the engine is still running and no engine noise has occured due to loss of oil pressure, and it is just the gauge that is not reading? If so, the oil pressure switch that is located on the camshaft sensor, could have a bad connection or the oil sensor will need to be replaced. The oil sensor is located on the left side of the engine and is mounting horizontally on the camshaft sensor housing.

That is probably a defective oil pressure gauge or a broken oil pressure sender, it reads 80 psi just because that is the maximum value allowed.

Pressure can be verified by reading it with a gauge tool.
If you really have pressure over 70 psi when engine is running then start replacing the oil filter, and check that the oil lines from pump are not obstructed, if there is nothing in there then replace oil pump.

If instead the gauge reads 80 with engine off, that is a defective pressure gauge.