I visited the website and saw the tester. It is exactly as you say. I can't believe they're letting those go for $80! That's a terrific price. Enough to make me think about getting one and changing the pressure guage**
Acutally, I'm not sure that would work, because I've got to think that a hand-pump made for 5000 psi is different than one for 300 psi.
Anyway, I sent them an e-mail inquiry to see if they have the gasoline version. We'll see what happens in a couple days.