help a4 1.8t boost gauge

[Audi You Do]

Hello Audi owners, iv recently become a happy owner of a a4 b6 s line with 1.8t engine and im wondering where people usually get their boost feed from ? do you tee into the FPR line as usual ? engine layout is a little different with it being longitudinally mounted so if someone could point me in the right direction that would be great.

Also another thing when im in 3rd 4th 5th 6th and i floor it the engine revs in between 3-5k rpm and makes a popping sound from the exhaust like it is cutting fuel...i have read it could be the MAF, i have a spare one i can try that was taken from a working car is there any other possible causes that can cause sputtering popping like this ....doesn't happen in 1st or 2nd.

Thanks any help is appreciated :) 

[Audi You Do]

UPDATE:

Had a good look around the engine bay and realised that a hose from the intake manifold to the N75 valve i belive its called already has a tee piece in that doesnt look very air tight, when moving the pipe it moves about a bit on the tee and the 3rd fitting is blocked off with a bolt, im going to replace it with some red vac pipe and secure the connections and fit a decent tee piece nd get a boost gauge fitted

 

[Audi You Do]

UPDATE: Fixed sputtering in high gears high load, car ended up misfiring with a flashing EML and then the EML stayed lit and car went into limp mode not boosting properly, replaced MAF and coilpacks then disconnected battery negative for 5 mins and done a TBA no more sputtering :)