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No oil pressure after hop replacement .the 6.0l has 2 supply tubes 1 for each head .also each oil rail has a dummy plug.all of which can cause a no oil pressure event.when u installed the hpp their is a fitting on the back of the pump .if that fittings o- ring was not replaced with factory o-ring it will blow out .no pressure .the truck will start if u have pressure.even if gauge is not working.so at this point u have an internal oil leak
Possible causes of the oil light coming on are - low oil pressure dirt in the passage behind the oil pressure switch a faulty oil pressure switch. Most people either replace the switch or have the oil pressure checked with a mechanical gauge.
Trish-if the engine is warm and/or the car has been driven, you should check the oil level after it has been shut down and sits for 5 minutes. If the level is good (within one quart of being full), you need to at the very least change the oil and try to go with a higher viscosity oil. For instance, if you are using 5w-30, get 10w-40 instead. You do not mention how long it has been since you had the oiol changed, what car/year/engine, and this information should be updated so that you can be assisted more thoroughly. If the light is on 'steady' (not flickering) and the engine seems quiet and smooth, it could be a disconnected sender unit or a defective sender unit-get back here if you can and try providing more information.
the oil is there to cool and lubricate the crank ( bottom end) and the cam shaft and valves (top end) the most likely out come is that you have (cooked) the engine, check to see if when you try to start dose the engine turn? if it dose then it could be the oil temp switch will need to be replaced. if the engine DOSENT turn then you have most probably welded the pistons to the block. seized the crank shaft or warped the head (head gasket) i hope this helps