The Gast R1 that I bought on Craig's list has great specs if you are looking for inches of H20, not so great if you need inches of Hg. Big difference I wasn't paying attention to when I bought the pump. I got the whole setup together with the R1 and couldn't figure out why I could barely get the gauge to read anything.
I now have a pump that I got from
Joe Woodworker . I also built the rest of the pump setup from parts from this site.
