Just finished rebuilding my turbo 2003 NB
car had a complete rebuild with a 3 shim boundary oil pump. Went ahead and switched the stock oil gauge out with an AEM and the car is stuck with low oil pressure. At my absolute wits end trying to figure out why. At idle and warmed up I’ll see about 6 psi. 3k will see 20~, didn’t bother bringing it higher than that.

is my oil pump already to blame or is there some other culprit that will keep me from throwing away all my time and money and tearing the motor back down?