dont really ever post here but figured id get a response faster than vivid.

okay i installed my gauges today besides my egt probe. here is what weirds me out...at idle my vacume is -15 to -21...at partle throttle it shows 0 almost all the way to redline or it will go to 20psi then drop to 12-15 and the i can hear the exhaust tone change like it surged...at wot it reads 20psi then tappers off. okay on saturday at rallitek using their gauge we set the the abc on utec for 16 psi. i put zip ties on real tight on all of my boost connections. all im using is the supplied t from defi. do i need something else inline with the gauge like the stock gauge?