wiring a 3 position toggle switch for two devices?
Here is the diagram with pins connected. Basically, the toggle switch PINS 3 and 4 are from the source. So when then HEAT is on, current will flow from 3 to 1 and return 2 to 4. Similarly, when VACUUM is on, the current will flow from 3 to 5 and return 6 to 4. 

Black wires are typically HOT and whites are NEUTRAL. Make sure all black wires are on the top (pins 1, 3 and 5) and white wires are on the bottom (2, 4 and 6).

I still recommend to connect the power plug to a power strip.

Let me know how it goes.

Sanity check: With an ohmmeter and switch not connected, check continuity between 1 and 3, then 2 and 4 with the HEAT on position. Do the same for pins 3 and 5, then 4 to 6 with VACUUM on position.