Abstract: A guidance system for an implement drawn by a tractor with the implement being interconnected to the tractor by a guidance hitch which moves the implement laterally with respect to the tractor to maintain the implement in proper alignment with the rows of the field. An elongated arm is pivotally secured, about a vertical axis, to the implement adjacent one end thereof and extends forwardly therefrom. A pair of gauge wheels are rotatably mounted on the forward end of the arm and are adapted to follow along the opposite sides of a ridge of the row. The pivotal connection between the arm and the tool bar is effected by an angle sensing shaft extending from a guidance sensor.