I just recently acquired a 07 spec b, previous owner has a boost gauge on the top of the steering column, I'd like a A/F ratio and Oil pressure as well, so was thinking A pillar, but wasn't sure about air bag as I've not really looked at the FSM yet to verify, but assuming from previous threads its possible to have a triple gauge pod on the a-pillar, while not interfering with the air bag, i apologize if this sounds like a stupid question, I don't have much experience in the way of interior mods, especially since my older 97, 03 & 04 imprezas only had 2 airbags not 6.
*EDIT* Correct me if I am wrong the side curtain airbag mostly sits alongside the ceiling pillars, I was under the assumption they were in the A-pillar & the sensor module is outside of the pillar as well? The only thing is the harness that runs up the A-pillar?