Vacuum Gauge and Boost Gauge differences?

[BHP Addict]

Before you all suggest

I am on my phone and it shows 1 of 112 pages with the search link somewhere around page 48 with no way of jumping pages lol

I need to know the difference between a Boost Gauge (PSI) and a Vacuum gauge (cmHg)?

What does the Vac gauge connect to and would it be worth having both?

Thanks

 

[Chrisdaman]

vacuum gauges usually connect to the inlet manifold, and show the vacuum created on no throttle, my boost gauge shows vacuum and boost (cmHG / psi)

 

[BHP Addict]

How? 2 needles? or Digital?

 

[matt_s]

As a rough guess a boost gauge shows the both boost and vacuum and is for turbo cars. A vacuum gauge will just show vacuum and will just be for normally aspirated cars.

 

[BHP Addict]

Riiiiight.

Cool, thanks mate.

Just making decision on gauges as it's Bday tomorrow and fancy some swooch fighter 60mm's.

 

[Robbie C]

Most boost gauges will have a vacuum reading as well

 

[-=Rob=-]

Is there a standard vac reading the Ibiza should read on idle and when coasting in gear down hills etc (no throttle)? I've read the boost pressure's for mapped, standard etc but had a quick search and there are different readings people quote for vacuum. I'm a little concerned mine's iffy as vac at idle is 50cmHg and sits at 60cmHg when coasting.