Anybody know how to hook up a gauge where the CD player in a '95 would normally be? If it's being blanked with a 1DIN plate, can I mount the gauge onto that?

There are lots of ways to do it, but a simple way is to make a flat panel out of a thin piece of plastic or metal and mount the gauge(s) in holes. Then you mount the panel where the CD player was. A plastic material that's easy to work with is styrene sheet. .080" or .100" thickness would work. It's easy to cut, you can paint it, and can even bend it if you heat it up. It won't kink or crease like metal.

Well, the next time I'm really home with my car is the Winter break, so it's all wishful thinking for now. I'll keep note of that but I'm wondering how to run the vacuum lines and how to tap into the wiring for the gauge lights.

This is what I'm considering:
http://www.amazon.com/White-Color-Boost-Vacuum-Gauge/dp/B000UO5OIE/ref=sr_1_26?ie=UTF8&s=automotive&qid=1256060206&sr=1-26

Comes with a T-fitting, 6' of nylon vacuum hose, and full installation instructions, although I'll be asking you guys for help instead.