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Well, 1 and 2 are definitely where the lines are supposed to go, but it seems like your ignition is opposite how it should be. My guess would be the tumbler (not this switch). It should be pushing that button when you turn it to the on position to cut off the circuit.
It could be the other way around, but it would appear to me as it it's more likely that the vacuum switch is correct because if it was made wrong, it wouldn't hold vacuum with the button pushed in (if you connect a mityvac to opening one when the button is pushed, you get no vacuum right?).
This is just really weird, and I would tend to think that the new tumbler somehow went in wrong... or it could just be screwy.
My advice would be to check it again even if you're sure, because I've been sure of a number of things like this and checked again... and suddenly found I shouldn't have been.
HOWEVER: you are definitely correct in that this is mechanical - nothing electrical involved.
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