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Vacuum switch – yes.
Wired incorrectly as described by frankr? – no.
The kill wires are electrically attached to the points. Yes, the vacuum switch is being used as a connection point….but to the center terminal (i.e. the same place the point is connected.). The kill wire is NOT connected to the mercury switch.
I’m at a loss on this one. Sure seems to me that electrically connecting these wires together (regardless of switch type or location of connection, etc.) should kill the engine immediately…and at low-to-medium RPMs it does. But at high revs?….nope. Yes, the engine sputters badly, but with the points tied together (and at least one point grounded at any moment on a revolution), creating a spark should be impossible.