my02scoobyjay

hi all got a standard 02 wrx i seams slow to me so ive fitted a boost gauge as the turbo didnt sound as if it was doing much after running it in different gears at various rpm the most boost i can get at full load is 4 psi /0.3 bar @ 4000 rpm but what i have found was that the boost gauge is fluctulating wildly as the boost comes in can anyone tell me what standard boost presure is set at as i cant see it being 4psi more like 8-10