i just installed the PROSPORT PREMIUM BOOST GAUGE. everything went pretty smooth during the installation. i took a drive on highway in 6th gears on 60mph, once i giving the boost it shows 18psi on the gauge and it drop to 15psi?? i heard dat MS3 run 15psi on stock boost, but how come mine is like dat? what do u guys think?? maybe i wire in wrong way or the vacum hose is leaking?? my current setup is synapes bov and injen intake...anyone help?? i can throw a pic of my wiring.