Interesting you should do this. I just fitted a Prosport 52mm Boost Guage and was appalled at the crappy design of the plug aperture at the back. You can get the boost sensor lead in OK, but the design of the housing and small aperture is such that there is almost no room to get a flat small screwdriver in there to depress the small securing lug on the plug to release it again. If you exert any pressure on the plug to get at the securing lug, you can far too easily move the entire guage in its housing, inside the glass, which then bends the spring-loaded shaft of the front push-button assembly so the spring fails to return it to its "out" position. Considering that you connect and disconnect it a few times when installing it, just to get stuff to fit and to check positioning, the pissy assembly is not at all good. The access on yours doesn't look much better.
CP_e Standback & PNP; CP_e 3" SS Downpipe; Corksport FMIC with Top-mount K&N filter & OEM Ram CAI; Turbosmart BOV; Dashhawk; Prosport Boost Guage; JBR solid shift bushes; DBA 4000 Wiper-Slot front rotors; Hawk Ferro-Carbon HPS Street front brake pads (@ 69,000km); Sumitomo HTRZIII's in 225/45 x 18