subaru.gtt.1995

iTrader: (2)

hi all,
installed my oil cooler plus gauges yesterday, oil press and oil temp work fine, but my boost gauge reads vacuum hg35,does go upto 0 when revving, but does not show boost when driving just stays at 0?
i connected it to return pipe from bov to inlet manifold,on a t-piece.wired wrong perhaps?
also the car does not pull like before install,slight holding back at full boost sometimes.
the vacuumlines are all ok and new, could this be a gauge problem?
thanks for your opinions!
regards