You neeed to drill @ tap on top of the fuel pump carefully above the diaphram. Install a pipe fitting & run your boost reference line to your intake manifold. The fuel pump has a diaphram inside of it & your reference line will send higher boost pressure to the top of the diaphram thus increasing fuel pressure.
As Hotrodrobert said, you can run up to 15 psi ,which is a fare amount of boost & way less hassle than running a noisy electronic fuel pump.
I was thinking the mechanical (stock type) fuel pump was good to only about 12 psi reliably unless you can find a higher fuel pressure mechanical pump, then you can run more boost.
IMO, running 6 psi of boost pressure is OK, they are like ho hum ,nothing that will put a big smile on your face, I have driven cars that run 5-6 psi stock, but when you crank up the boost to @ least 10 psi, then it is something you can feel the power increase. Those cars (factory low boost turbo cars)are set-up w/a mild tune & a safe tune, really rich.
So even w/6 psi,, you still can play around w/the timing & the A/F ratios it can help a lot over a stock factory tune.
So a recap: a mechanical fuel pump will be more reliable,no real noise, & fuel pressure will be low when engine rpm is low,like @ idle, which is a good thing as to not heat up your fuel.
