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trying to install a idle up ` vacuum system in to my 38 PDSI solex carburetor. got original bracket and dashpot of a PDSI 36-40 carburetor and fit perfectly to my carburetor base. now how do i install the vacuum line. can i connect it to manifold vacuum where my brake booster is connected do i need a switch over valve ? can anyone show me step by step the simplest way to install a idle up