its a BAP, doesnt hook to vacuum. The EGR hose goes from the fitting on the lower portion of the EGR pipe to the transducer bolted beside it(fitting underneath). The EGR vacuum line has a 90 degree bend(the one that actually plugs into the top of it), and the other side goes to the solenoid beside the relays just beside the A/C accumulator, the other side of the solenoid goes to the vacuum tree under the cowl area I believe. If someone has a Chilton manual it also has emission diagrams in there