This is what I bought, VooDoo Boost:
http://cgi.ebay.com/ebaymotors/Voodoo-III-MBC-Manual-Turbo-Boost-Controller-0-30-PSI_W0QQitemZ280021929759QQihZ018QQcategoryZ33742QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
I asked for the 6mm fittings a light guage spring. I did have to get some plastic reducers and extra hose from the hardware store. I can remember, but it was like 1/4 to 3/4" reducer or something. I just took some line in and the controller and got what I needed, and went ahead and replaced the waste gate line while I was at it too. This also allowed me to make it longer (instead of just cut and splice adn have it hang out under the air filter) and mount it somewhere, which happened to be on my grounding cable I think. Easy access.
I used the fuel pressure guage. It's tiny, and it worked. I mounted it too my windshield becuase I didn't care about it. BUT, if I could find a boost guage for less than $20, I probably would have bought that. I couldn't find such a thing though when I needed it.
Adjust to where you want, get rid of the guage on the windshield, and be happy!