can i use an AP as a boost gauge?

[Dean wrx]

i have a cobb ap and i'm installing a downpipe soon and going sage 2 on the ap. I ordered a boost gauge too because i need to monitor the boost due to the stage 2. The boost gauge seems confusing as sh*t and a pain in the ass to install (different color wires, connecting the different wires to different electrical sources, cutting vacuum lines, et.) The boost gauge was 0nly 40$ so i dont really mind if i dont use it. I figured i could just mount the ap somewere and use it as a boost gauge because it measure the boost too. Would this be OK?

[wrxtreme06]

ive used the AP to measure my boost and found it to not be very accurate. i would try to find some locals to help you w/ the gauge install. it's worth it.