A friend of mine fitted a boost gauge on my car over the weekend, and for some reason its causing a fault on the dump valve. The car doesnt seem to dump as loud or sometime doesnt dump at all. The place where we fitted the T connection was advised by Scoobyclinic and its the pipe that connects to the side of the dump valve.

Anyway i have now disconnected the boost gauge and everything seems normal! Any clues why it doesnt dump normal while its connected?

thanks

Will