You don't want to touch anything until you get at least a boost gauge, fuel pressure gauge, knock gauge, and some kinda of scan tool: t-link, scanmaster, otc scanner, something!! It would also be nice to have a water temp gauge and oil pressure gauge in the car.
But, to answer your question you need an adjustable wastegate rod or boost controller(manual or electric) to turn your boost up. Then you need an adjustable fuel pressure regulator to turn you fuel up or down. An adjustable fuel pressure regulator will have a allen head screw on top of it. You turn the allen in to up the fuel pressure, but you don't want to do this without a fuel pressure gauge! Don't turn you boost up without a knock gauge either. You can easily blow a headgasket without being able to monitor you engine.
How much boost is it currently running? Do you have any fuel system upgrades? Fuel pump? Hotwire kit? Did the previous owner give you a list of what mods you got? You may want to get every detail you can get off them.
Oh ya don't use the stock boost gauge, they are junk. Read everything you can and understand what you are doing when turn up boost and fuel or you will be rebuilding that motor. That is no fun. Do some searches on turning up boost. -Nick.