Thanks, I'm going to look into this. Do you have a pic of the one you got?
I got the boost gauge finished last night (Prosport Performance in Block8head pod). It powers up and does the sweep, and appears to be functioning mostly correctly, but doesn't do a shut-down sweep, and seems to peak at about 14 PSI. I'm thinking either A) I haven't wired the power correctly which could possibly cause both issues, or B) this gauge doesn't have a power-off sweep and I have a boost leak somewhere. With just the ACC power on and the engine off, the gauge reads about -1, so it seems like it is calibrated a little off too.
So I'll try Qwik's reducer trick, and look for some more solid T-bolt clamps while I'm at it.
A few quick pics... don't mind the protective sticker I hadn't removed yet, or the dust and dirty winter mats:
Shut down sweep? Mine does like 3 sweeps at start up. When I turn the ignition off it goes to 0 and changes colors a few times and blacks out.