[MINI-Morgan]

Gas leak stray? Fairy liquid but 40times more expensive? I'd be amased if it will tell you anything being too light for the air flow that you would experience.

Does the boost go up as you open the throttle but it reaches a point (6psi) and then drops a bit again and you can hear a blowing sound?

I hope you are testing with your foot flat to the floor as this cant be tested on a drive way very easily.

Also are you seeing negative between -8 and -14psi at idle? (if I have converted that correct.... I always work in absolute pressure instead)