Notes: 171011-91100 TACHOMETER is original YANMAR product. 171011-91100 TACHOMETER4 is commonly used in transmissions/axles/engines 4TNE84-P, 4TNE88-GR, 4TNE88-GR, 4TNE84-P, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849