so my 2000 s40 is not boosting like it should. i installed a boost gauge today finally. i tapped it into the far back vacuum line on the manifold above the throttle body. it shows at full throttle in sport mode im only boosting maybe 5 of 6 psi max. its the same amount of boost i was getting off the obd2 reader before i installed the boost gauge so i know i didnt cause a vacuum leak. i also know i dont have any detectible vacuum leaks that i could find. could it be wastegate? thanks guys!!!!!

 

What is the boost supposed to be?