Are you going to keep the emissions stuff?
The brake booster line is the BIG vacuum line that goes from the brake booster(behind the master cylinder) to the back of the intake manifold. I did it this way for a min then it looked to Ghetto. SO I tapped into the P teminal on the throttle body instead. ALSO there is a part you can buy that is just for this purpose(I cant find it right now). Also its a MDP sensor not a MAP
