[MATCHBX]

I tried one of those Faze guages a few years ago and didn't really feel it was good quality to begin with. Way too twitchy for me. It was brand new out of the box and I could hardly read what I was boosting at because it twitched so much. Sounds like a guage problem.

Buy or borrow a quality (known good) guage and put it in there. See what happens then. If it works right, then it's your guage. If it still does the same thing, then you'll have to dig elsewhere. Eliminate the easy stuff first before you assume it's something major. If you need, I have a guage here you can borrow to test it out.