HY! Fot start I´m from Croatia so I appologize for possible errors in writing.
I have a problem with my boost gauge on my Astra Coupe Turbo. (Z20LET) When car is idle it is showing -1 bar, but it should be showind -0,7bar, am I wright? And when the car is on maximum boost it is showing only 0,5 bar and then drops to 0,2 bar!
Besides that the car is working properly.
What could be the problem? Is it posible that the boost gauge hose is rupted or something? And how to solve this problem?