need help troubleshooting

:
2007 Black MS6GT
okay, so the dealership installed spark plugs and a boost guage for me, now the car is ****** up, naturally, after they left me the message on my phone "everything works great!"

i am getting compressor surge during every shift with no turbosmart noise whatsoever, but more like chattering of the piston, the boost guage doesnt work, it just beeps at me nonstop, and doesn't even show the mercury reading. just stays at 30psi and blinks. i checked all boost lines, took off the bov, put it back on, restarted the ecu, etc. everything seemed fine, the idle is fine, the acceleration and gear changes are fine, the only thing i couldnt see because it was too dark and im not at home with my lights is the TIP. could this all be due to the inlet pipe being loose? i hear the intake sucking air, but everytime i let of the accelerator i get all turkey and no ffffffCHHH. this is not an HKS BOV.
 

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