Just an FYI. I went to Stewart Warner's website and found that a local shop called Speedometer Service is a dealer for them. I called and ordered a boost gauge. It came out to $49.xx, which is a bit cheaper than 42nd Draft Designs, which is where everyone says to go. You have to wait about a week for the gauge to come in, but oh well. Just a heads up. If this is common knowledge, sorry.

Speedometer Service & Instrument Co
3551 NW Front Ave

Portland, OR 97210 - 1301

(503) 227-5567