does this mod completely bypass the stock fpr
YEP
or if I want to run a fuel pressure guage to my cab do I need a completely separate regulater to boost incoming pressure?
yes and no, you will install a new regulator that is adjustable and it controls pressure leaving the heads,you can tap off the regulator to a gauge line
I know this is probly a dumb question
Not at all, there are no dumb questions.but I'm confused as to wether this mod boosts incoming . or just evens out the pressure to all injectors.
both, it evens out the flow, pressure and regulates the incoming fuel pressure by restricting the exit pressure, so it backs up ,and the incoming fuel will run at what you set it to be on the regulator.