35695-ZY3-003 Sensor (TDC1-TDC2) - Overview. The 35695-ZY3-003 Sensor (TDC1-TDC2) is an essential part of Honda marine engine systems. It supports the ignition and fuel injection control by accurately monitoring the top dead center positions of the crankshaft's first and second rotations. This precise data enables the engine control unit (ECU) to optimize engine timing and performance, ensuring your engine runs smoothly and efficiently. Designed as a genuine OEM component, it guarantees seamless