just fitted this

and when its ticking over it sits on vac is that right ?

 

I would say thats correct because the engine is not under any load so your not creating any boost

 

yes that is right

 

That is right yes

 

cheers guys

 

Yep indeedy

 

that's nice, where did you get that?? how much was it??

 

that's right, when the throttle is closed there is depression in the manifold causing a vacum.

Throttle open and no boost is atmospheric pressure, so reads 0

With boost the gauge will read pressure !!!

The ford racing gauges are available through burton's !!!!!