I am currently assembling my fuel system on my MKIV. I did the piece-by-piece method due to the relatively high pricing of "kits". Anyway, my questions concern vacuum lines for the FPR. I noticed there is a switch (not sure what it's called) that connects a vacuum line to the stock FPR. Will I be using this to raise fuel pressure or is this all controlled by the new FPR (Aeromotive)? Do I need this switch if I am running AEM?