And when I did so, the factory boost guage read 40 mmHG, the car idled really rough (I'm assuming because the secondaries were dumping just sitting there idling at 750) and my Apexi' guage obviously read regular vac at idle. Is this a bum FCD or did I do something wrong? I have an F-CON installed and I just plugged the FCD into the boost sensor and plugged the wire running to it into the FCD (the FCD is in series with the boost sensor and the plug that runs to it). Any thoughts?