I have a Clark TK22 (I believe) or a TK20 not sure how to tell the difference. I would like to know if anyone has connected it to a Tamiya rotation servo (from Abrams) and if so how would you accomplish this? I am making a static tank full function RC and I already have the Clark board for an Abrams so that is what I am going to use. There are instructions online to make the board use an elevation servo and to make the recoil unit work with a servo but not sure where to connect the rotation unit . Thanks any help is very much appreciated , Jim.

Couldn't you use a continuous rotation Servo and simply drive it directly from the receiver? I don't see any reason why that wouldn't work.

First, the Tamiya abrams doesn't have any servo for turret rotation but an unit based in a motor and gears. You should connect following the picture below TK20/Tk22, the blue circle shows where you have to connect the two wires of the Tamiya abrams turret rotation unit as is the name of the part. Now if you really have a continuos rotation servo instead a part from the tamiya kit can connect directly to the receiver as was suggested above.

No this is just what I needed. Thanks for correcting my vernacular . Yes indeed I have a Tamiya rotation unit not a servo. This pin-out diagram is just what I needed though thanks you again.

You are welcome, but check the clark website for all the information about the board.