Connect the measuring equipment

Fig 1: Connecting Manometer 999 5230 With T-Piece In Between

Courtesy of VOLVO CARS OF NORTH AMERICA.

Remove the turbo control valve from the air cleaner (ACL) housing
Remove the red marked hose from the turbo control valve.
NOTE: If it is not possible to pull it away, cut the hose.
Connect manometer 9995230 with a T-piece in between.
NOTE: Route hose with manometer inside the passenger compartment and hang up the manometer vertically.

WARNING: Test drive on a quiet road. Drive safely. Abide by local traffic regulations and speed limits while test driving.