where would be the best place to tap a fitting for the boost gauge?

 

T-off of any vaccum source i did mine right off the back of the intake mani

 

 

what about after the bov before the tb?

 

if possible you should use a short, non-t'ed line from the intake manifold for the boost gauge.

 

like drill and tap the intake manifold and hook up a fitting for the boost gauge?

 

yeah, that would work if possible. can you find an existing vacuum port that you can free up? that would be easier that drilling and tapping it.

 

just T it off of something, dont go through all of that hassle of removing the intake and shit to drill/tap it. everything pressurizes at the same rate so one place wont give you a different reading than another.