Originally Posted by tabetha
If you have never seen a boost gauge of the type talked about here you really need to get out more.
Well, I was with your for a while, then curiosity won me over and I had to have a look
You can clearly see in.Hg on the vacuum side, and PSI on the boost side
Went out and checked my Ford Racing boost gauge and it's the same.
So I thought, maybe they are both measures of the same pressure, just different units
Well, to convert in. Hg into psi, you need to multiply in.Hg by 0.4912.
Do boost gauges indeed convert pressure/vacuum into two different units depending on which side of 0 they are
It's a genuine question, not trying to stir things up
