According to one versed in the matter, " If all else fails and you don’t want to remove the intake manifold. . . . There is a spare vacuum port on the back of the intake next to the brake booster vacuum line. Obtain a vacuum reservoir canister, a check valve, and a 5/32” Tee from any donor vehicle (or buy new from a parts supplier). Run some 5/32” hose from the spare vacuum port to the check valve then to one side of the Tee, making sure the check valve allows air flow toward the manifold. Run hose from the other side of the Tee to the switchover solenoid, and from the remaining port of the Tee to the vacuum reservoir. The only thing left is to seal off the old hose at the manifold. Cut the old hose off close to the manifold, use some solvent on a rag to clean the area around the cut-off hose as best you can, then dob a bunch of RTV over and around the cut-off hose."