Found another source of commercial pressure taps
 

The Auto Research Center (ARC) in Indianapolis apparently makes their own here, under the tab "Full Scale Pressure Taps."

Looks like a different design than the Scanivalves, which use a round puck--these have a tapered shape. I'll see if I can find out their price.

I didn't realize something like this was in Indy. I wonder if I can get a tour or something? That'd be neat.

If you get a tour, I want to go too--I've been meaning to see if I could visit for a while.