The board is your only option. I have 3 sets of Sierra gear that down and locked converted for me. Same board and actuator that robart uses. And the actuator will only work properly with the board for back and forth operation. The set that I have for my ESM mustang is no longer in use but I have a h9 150 mustang waiting on good gear. I ordered a set of robart 630 that will be getting the electric setup off of the ESM gear. I have looked everywhere for the controller that they use. I have found the motors but no controller. (