Rear Main Seal

Aaaah, it is amazing how things like that will make us more energetic.... Very good news! Worth the effort.

As for the pressure, that HV pump should have a 70-72 psi relief spring in it. And, 10W30 synthetic ought to be pretty moderate for pressure. Hope the oil pump was not 'addled' during R&R....
- Rear seal? No way I can imagine.
- O ring? Anything messed up in the filter setup now?

I think I would first suspect the sensor. It this a mechanical or electrical gauge?

Roller cam, I hope?