Haven't put a manual gauge on it yet or wired in my map sensor for my Aeroforce either. I'm assuming 7psi since that is what procharger said, but they also said that a 4.38 pulley was standard in the kit?
Am I the only one who has a P1sc that came with a 4.5 pulley? It was bought back in 2011 so it may have been one of the first kits but most of the people have a 4.38 pulley that comes with their P1sc.