This sensor monitors the rotational speed of the power take-off shaft. It is mounted in the electrical system of the host tractor and sends a signal to the control unit that manages PTO engagement and disengagement. When the sensor fails or provides an erratic signal, the control unit may prevent the PTO from engaging or may trigger a warning light on the dashboard. As an original-manufacturer component, its electrical resistance and pulse output are matched to the control unit's input requirements, ensuring correct engagement timing and clutch protection.