I am trying to track down what appears to be some sort of vacuum switch or vacuum valve under the dash.

Ever since the SC was installed, I now have an annoying tick under the dash whenever the car goes into somewhat high vacuum. So basically every time I let off the throttle. I guess it could be my boost gauge, but it sounds like an electrical tick and it sounds like its coming from under the steering wheel.

Anybody have a vacuum diagram or have any ideas where to look?

The only think that I have done on that side of the dash is to disconnect the airbag computer, but I can't see the airbag having anything vacuum controlled.

Hook me up!