I found a mechanical oil pressure guage at the house and installed it but it was too late to start the car

If the pressure is the same I will
1. Check the pressure relief in the pump
2. Change the oil and filter (It was a fram filter and synthetic oil) I will check with our Napa
3. Check for any fuel in the oil (it is an EFI engine with 83 lb injectors wheer 36 lb would probably do, but I will be procharging it and need those injectors in the future)

Anything else?

Thanks