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I use the 12V power supply from an old CPU and activate the Tortise with a SPDT miniature toggle switch. Run the plus side to one leg of the toggle and the negative side to the other leg. The center then goes to either the #1 (or #8) position of the switch machine. Then run the ground wire from the CPU to the #8 (or #1) position of the switch machine. Yes, I run a three wire bus. I only use DPDT to activate a Tortise from two different locations. I also pull a 5 V source from the old CPU and run a bus to activate building lights using the ground wire already mentioned for the other leg.
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