This inductive sensor monitors rotational speed or position within the gearbox housing of the host tractor. It generates a pulsed signal that the transmission control unit uses to manage shift timing and clutch engagement. A failed sensor typically produces erratic shifting, a loss of gear display, or a transmission warning light. The manufacturer machines the sensing face and thread to match the original housing bore, ensuring the correct air gap for reliable signal generation without mechanical interference. When replacing, clean the mounting bore and tighten the sensor to the specified torque to prevent oil leakage and signal dropout.