If you don't use a mass air modifier then normally your boost gauge won't read inaccurately. There are different ways to scale it so that does not happen if you opt to use one. I can handle it either way.
http://www.unleashedtuning.com/ford-gt/
Our Ecoboost Mustang results, this car is an automatic with performance package :
https://www.youtube.com/watch?v=NL7DNC0RiSs&list=UU7kBD__0nPPAeinUiPuGwJQ