Why not do a 3 way electric valve and program it to respond to manifold pressure? Have one leg to the engine and the other to a vac canister. When you are under vac just draw on the canister with a check valve in place?
unless I’m thinking about it wrong, but that’s my 1 min overview while having a coffee at a random dunks somewhere
unless I’m thinking about it wrong, but that’s my 1 min overview while having a coffee at a random dunks somewhere