Help identifying part & connections

So I have need help identifying some connection on my bronco. I have 2 components I believe are Ported Vacuum Switches but am not sure. One has 2 connections and the other 3. The 3 port is on top of the thermostat housing.



Are these Vacuum Switches? If so what should they be connected to.

Yes, sounds like temperature controlled vacuum switches. Depending on the year and configuration they could have been for a dual diaphragm distributor and/or an EGR. The 3 port in the t-stat housing is usually for the dual diaphragm distributor.