Ported or manifold vac for overdrive bypass vac switch?

MV8 said

Ditto. The vac switch by itself will not make the overdrive work. Are you saying you bought the car with this combo and it worked but you need to reconnect a hose to the vac switch? Look on the passenger side of the transmission for extra plumbing and two oil pressure switches and wiring or extra switches in the car to manually control it.

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I really disliked the switches being directly on the trans exposed to who knows what.
I put an npt to compression union fitting on the governor port, and ran a section of cooler line up to the back of the intake and mounted my adjustable pressure switches next to the distributor so they can be easily accessed.

That said, anything connected to the governor port could be a hint as to what he has.