Those nylon tubes and crush nut things suck! 1) if it's not tight enough, it'll leak. 2) If it's too tight it'll cut the hose, and leak. 3) If you tighten it, then loosen it to make an adjustment, then tighten it back down w/o putting a new crush ring in there, well then it'll leak.
I've got a baggy of the crush rings if you need some, or you can get 'em at the Napa over by Summit. And if you need some help, let me know, I'm happy to help out too! I've done the autometer boost gauge install a few different ways in my car, and in Art's car.
Oh, I used the back of the hazard light switch for gauges... it's got Constant Power, ACC, Illumination, and Illumination Variable Ground wires in it... plus there's a chassis ground right there on the radio. Pretty much everything you could ask for. And it's right next to the clock pod which is nice for a center gauge pod, like Art's got.