I think you can order one from magnacharger... Mine happens to be a hand me down from a friend who had a supercharger on his Camaro a couple of years ago. It is a nice Autometer gauge and at a price I couldn't beat... FREE!
I can't adjust boost unless I change the pulley on the supercharger snout. Since I see that I'm making 7 PSI peak with my gauge, I know I'll move to the 2.9 inch pulley soon.
All the connections on the kit are very easy to tighten and I would say that unless they discovered it and called right before closing time they must indeed be enjoying the ride
Cory