inHG Levels?

[Anquetil]

I've just had a Dual Stage Boost Controller & TypeX Boost Gauge fitted, the left side of the gauge shows in inHG and the right side shows in PSI.

At the moment the gauge sits on 20 inHG on idle, i'm going to ask a dumb question... Is this 'inch of mercury' or 'inch of mercury vacuum'?

20 'inch of mercury' = 9.8 PSI ?

20 'inch of mercury vacuum' = 4.87 PSI ?

The guy who set it up said the low setting switch on the boost controller was a little lower than standard boost level, so does this mean that I'm running about 4.87 PSI? It seemed less powerful on the drive home.

[Anquetil]

Can anyone please help, as I want to start fiddling with the high switch on the boost controller?

[Lippo]

If there is a zero in between the two scales,then it is vacuum

[netrati]

Of course it's vacuum at idle. To know how much boost you car is putting out you have to look at your gauge when you floor it and keep it there. Don't worry about what your turbo is doing at idle, cause this doesn't tell you anything, just when you're at wot. It sounds like the mechanic already set it up so just flip it over to the high boost setting, watch your gauge, and make sure it doesn't go over 1bar or 15psi.

[Anquetil]

I thought it was 2 seperate readings that you could switch between INHg or PSI... Me = Derrr

Yeah, but as you said it doesnt go into positive until you floor it, as I found out today.