BTW, my install consisted of:
Disconnect fitting at FPR
Put 'T' in
Put hos from 'T' to FPR
Put long hose from 3rd point on 'T' to the boost guage in the car.
I only hooked the guage up while at the track and again yesterday for some toying around, so I didn't go through the firewall. I went across the engine to the passenger side, out the back of the hood, around the A-pillar, and through the window, to the boost guage sitting on the center console behind the shifter.
Not the ideal place, but when I get my permanent guage I'll probably relocate the accessory outlet down below the radio where Will has his boost guage, and bore out the original outlet hole up high to accommadate the larger boost guage so it can be seen easily.