Oil pressure gauge issue

put mechanical pressure gauge to see if pump or gauge is problem

Remove the oil sender unit and fit a pressure gauge , start the engine and check pressure, seems odd the oil light and pressure gauge both showed a fault at the same time, perhaps the oil pump relief valve stuck open for a short time.

yes,it reads oil pressure only,if its out as long as it was working fine before it went bye bye your fine,you won't blow up engine or break down.

It sounds like there is a problem with the oil pressure sending circuit. The oil pressure sender changes voltage according to the differences in oil pressure. If it is pegged all the way to the max, there may be a short (or open, depending on the way the circuit is designed). I would take it to a shop and have the oil pressure tested with a mechanical gauge first, just to be sure there isn't a problem with the relief valve on the oil pump. But if the oil pressure gauge isn't working properly, you won't know if there really is a problem with the oil pressure, and that could be catastrophic to the engine.

Your problem may have nothing to do with the sensor but in fact, the pressure relief in the pump may be stuck. Install a mechanical gauge on there temporarily and check the actual pressure. If normal then the gauge wire may be grounded somewhere. If it reads the same as the one on the dash then the relief is stuck (sometimes it can be freed up by draining the oil filter, filling it with marvel oil and re-starting, sometimes takes time though...otherwise you'll need to take care of the pump)

check your pressure with an external gauge if you really do have high pressure then you pressure relief valve on your pump is stuck not easy on your seals but as long as it isnt fluctuating( pumping all of your oil out of the pan before more can trickle back into it) or not over 85ish youll be fine. check for sludge of foriegn objects, it might just be stuck but it may have something stuck in it. if your gauge is wrong its probably a short, you should look for frayed wires but youll probly have to wait for something else to go before youll find it

the oil pressure gauge replace it its not working it is stuck.

Have your oil sending unit checked, this part is not to expensive

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.

sounds to me like you have a bad oil pressure sinding unit