When i am in first gear at about 2000 rpm and WOP i only get 5 psi when it is supposed to be 10, and other times i can get 10 psi in first, it does this most of the time (messing up), does anyone have any idea what it is?

 

i am not sure, but first and second gear have inconsistent boost usually- atleast my car its inconsistent.

you should worry about getting less than 10 psi on third and up.