Ac/heater install question

If I recall the factory AC in my 1969 Dart with the pneumo-electric 5-button pushbutton switch, there are 3 vacuum hoses to the engine bay. One is the vacuum source at the intake manifold, usually shared with the big tube to the brake booster, a spider-tube fitting. The other two hoses go to the water-valve (push-pull vacuum operation), which shuts off water flow to the heater core when using AC. The defroster door would be controlled by a vacuum pod under the dash. Most/all are also push-pull so 2 vacuum tubes. There are color stripes to distinguish the hoses (recall green and red). You can still buy the 5-button push-button switches new (~$90).

My 1965 Dart is factory non-AC and has manual climate cables. My 1965 Newport is worse since factory non-AC but a 4-button pneumo-electric pushbutton "not avail". Long ago, I hacked a way to substitute a 5-button switch. I also added a relay for Blower-Hi position so that high current doesn't melt the pushbutton and blower switches, often a problem as-found in many cars by many manufacturers before they learned to embrace relays.