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So I’ve been having a issue with my oil pressure spiking to 80 and dropping to 40 for about 3 weeks thought it was just the gauge going bad untill oil pressure dropped to nothing about a mile from my house. I limped it home slight lifter knock oil pressure alarm on dash telling me low pressure etc... so I pull the timing cover drop the oil pan clean everything extensively change the oil pump front main seal oil pickup tube gaskets o rings etc get it all back together and I still have little to no oil pressure with all seals in tact no leaks anywhere any ideas?
 

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Try a new oil filter.

If no change, you need to have the pressure checked with a mechanical gauge.

If the gauge reads correctly, you have a bad pressure sending unit.
 
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