possible vacuum leak?

[audi-tone]

Hi Fellas, been a bit worried about my car, its a mk4 gti, stage 1 with full exhaust and k&n induction kit. over the past couple of days the vacuum reading on the boost gauge has been getting higher and higher, usually it would sit on -20 on idle but right now its sitting on -15 and even coasting in gear it wont go below that. (where as normally it'd head down to - 22-23.
in saying all this idle is smooth and boost is stong as ever. can you have a vacuum leak and not a boost leak? i thought they where primarily the same system?
Help?

[noone]

Odd... Where is the gauge tapped? From a connection on the manifold?

Could be the throttle body needs to be reset or I'd gunked up.

[audi-tone]

actually on closer inspection one of the vacuum hoses from the fuel pressure regulator down into the manifold had a slight crack. all fixed now! thanks anyway