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19 There is only one electrical hook up that needs to be addressed for the trans. This little vacuum switch will prevent the converter from locking up under wide-open throttle, heavy acceleration, or while going up a steep grade. One wire goes down to the trans and one wire needed to be run into the interior and tapped into a keyed 12V source. It also needs a vacuum line ran to it that was picked up from under the carb at one of the many ports.