No oil pressure

[Dsmturbo]

I have a Ka24de that I bought a car not running pulled the motor and re gasket the whole engine and started it up and sounds like a knock noise on start up then runs Normal 2 seconds later I have been driving it around for a few days. The knock noise has been getting to me lately and ended up pulling the pan again and checking rod bearing and they look brand new still. I have stock oil pressure sensor and no light and I ended up buying an aftermarket oil pressure guage and it reads about 4 psi at idle when warm and when I get on it gose to about 60 or more psi. The scary part is that I have done 5 drift events already before I installed the oil pressure guage and after I pulled the pan??? I do have a slight dented oil pan and yes the o ring on the front cover is there and new oil pick up gasket also should I change the pan and also the oil pump or should I just keep running because is dose have over 100 laps drifting