PA Dodger
Well-Known Member
I have a hand me down name brand vacuum gauge. It reads 2" mercury when not hooked up. So, I bought a name brand new one. Same thing. I know altitude plays into the gauge's reading but I'm at 675' above sea level so the error should only be 1/2" maybe. I researched and don't see any way to zero them out. Am I missing something? I know I can do a little math-a-ma-cating but I like it when things are what they are supposed to be. Am I missing something here?