My 4th Mini
 

I've had 3 Mini's, the most current one is a '23 JCW F54 All 4. Today I obtained a 2006 Mini Cooper - S. This is my first with a supercharger and not sure how to determine/measure performance. How can I test boost pressre? What should it be?
I have an "ODBLink MX+" scanner and was wondering what the boot shold be?

Being as this is my first supercharged vehical, thanks for any and all info.