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Check out the first post in this thread Any acc switch will work, no voltage is required. The PCV senses continuity only. Read the post carefully, he explains how to create a rich base map, and then use AT to run leaner for better mileage.
I just got the HD switch set for the handle bars. It holds 3 switches, so I use one for the gps and one for the PC V. Probably could also get aftermarket from Kuryakin or other company.