For most centrifugal supercharger installs you will need to tap into a vacuum and boost source to be able to control your blow off valve or your boost-a-pump or you may just be looking for an easy source for your vacuum or boost gauge. The commonly accepted method is to source vacuum and boost from the brake booster line since it comes right off the back of the factory intake manifold. These blocks are what ProCharger includes in their supercharged HEMI kits.
