Nevermind, got it fixed. Turned out that I had the boost/vac gauge hose in the wrong spot. I originally had it on the nipple used for vacuum diagnostics. The vacuum part of the gauge worked fine there, but apparently the boost part doesn't. So I moved it over to a hose coming directly off the top of the supercharger, and voila. Everything works perfectly now.
It's actually making upwards of 8 pounds of boost, which makes me happy. More power for me.
Awesome. Can't wait to see how it does on Thursday.