Installing a 485, or else you'll just burn up the controller because the Walbro draws a lot of amps. I have mine wired direct to the battery with the deautchwerks kit with a tomei large diaphragm fpr, my psi at idle is 32 with the vacuum connected but my car still runs 13.0afr at idle and now it's at 10.6 at wot on a e85 eprom.