Man just buy good gauges to start with, autometer are awesome, all the vdo stuff I have seen is ***, don't even get me started with autometer pyrometers, good grief total crap. Regular 0-30psi air pressure gauges work just fine, wyldman has got it witht he DIY adapter.
You will need more "on boost" fuel to get more boost.You will now have to start playing with the boost pin.You may be able to get a bit more with the fuel screw,but it will be smokey off boost,and may not want to idle down.