Here’s hoping the Dinan app is crap when it comes to the boost gauge.

-4 and -5 when driving? 1psi at 4.5k rpm?? I understand vacuum is a thing. But only 1psi when pushing it?

I may put an OBD Bluetooth to confirm.

 

Did you calibrate it first. On mine it shows over 15 lbs at full throttle.

 

I would plumb in a mechanical boost gauge into the intake manifold. Then you'll know EXACTLY how much boost you're getting.

 

Looks like it was the app. I used an OBD and another app - 14psi!