Don't know where the OBD II takes the reading, but my ScanGauge II shows vacuum as well as boost.

 

But how much vacuum?

Also there will be another gauge on the market in the near future that will use ODBII port. Not sure if I can say any more at this point.

 

Couldn't say with any accuracy. I just notice -negative numbers and move on.
Cravenspeed had OBD II gauges for the 2nd generation at one time. The last time I checked they were working on a set that will work with the 3rd gen cars. I had a set on my R56 and loved them.

 

With an N18 engine and a manual boost/vacuum gauge can I tap into the hose that comes form the valve cover to the intake tube? Will this give any readings at all or is my gauge malfunctioning ?

ISAMIN

 

With the N18 engine and a manual boost/vacuum gauge can you tap into the hose that run from the valve cover to the intake tube? will this give me a reading or is the gauge I'm using (old) not functioning properly

 

Wrong section. The F56 3rd Gen MINI's do not have the N18.

 

Sorry for the 'simple' question, completely new to the MINI world, but not turbos. So is the tap you guys are using somewhere between the air filter and throttle body? If so, your 'low' readings are what you will get as the vacuum would only be generated between the throttle body and cylinder head...in what I would call the "intake manifold". Either location will show boost, but only the intake manifold location will show a 'high' vacuum reading. On my Mustang's engine I pull ~12" vacuum at idle, 6-8" at part throttle cruise and ~20" off throttle decel. Most stock cars I am familiar with pull ~16" at idle.