One other alternative would be to look into pneumatic solenoid valves. You would need to look for a "reversing valve" to get the flip-flop action of the original shifting valve.(See next post for a better search term and explanation - 5/2 valve) A lot of those valves use 24v coils as that is what a lot of industrial PLC controls use, but 12v should exist, and the coil section itself is pretty modular.
McMaster and Automation Direct are a couple of places to check for those valves.
Last edited by Puffie40; 09/24/2024 4:32 AM.
