Originally Posted by jr_ss

3 and 4 are not vacuum sources... They are located directly at the throttle plate. Anything after the throttle plate is a vacuum source, such as 1, 2, and 6... There is also another vacuum source that the FPR solely uses on the side of the intake manifold. That leaves you with 1, 2, and the FPR sources. How you run them is up to you. I would not use the FPR source for a boost controller/BOV option. Put your gauge on there if you have to put it anywhere.