BTW, the changeover valve is pin 30. Not sure what this "connector 2" is that you keep talking about, but it's on connector "C".
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C30, to be exact.
Something I've considered to simplify things a tiny bit is eliminating the vacuum and electronic changeover valve. As it is, the system requires air pressure, electricity and vacuum. Why not just feed the electronic changeover valve signal to a relay that powers a solenoid operated changeover valve?
I may try this...
Thanks for the info, Gelb