I've been doing some more reading and watching videos of amc servi controls and what I suspect were tac wires may not be. I watched a video where a guy was explainind hooking up a controler and he used it in a current monitoring setup andsid that if he had a tac, itwould be attached on the front of the motor, which I do not have. So, mine may also be a system which needs to be cuurrent or voltage monitored for speed. Any insight?