Feb 09, 2021 · Measuring 5 1/2” x 3 1/2” x 2”, the ECD-200BT allows the use of a mechanical-cable speedometer to be used in conjunction with a modern drivetrain which provides only an electronic output. 36” cable available for GM thread-on, GM clip-on and Ford clip-on style speedometers. Powerful motor is quiet enough to mount the module inside the cabin.