32540-ZY3-800AH Digit Spd/Tach Hrns - Overview. The 32540-ZY3-800AH Digit Spd/Tach Hrns is an essential wiring harness supporting the digital speedometer and tachometer systems in Honda marine engines. It plays a crucial role in transmitting accurate digital speed and tachometer signals to the boat's instrumentation, ensuring reliable monitoring and operation. Designed for seamless integration with existing components, it maintains optimal engine performance and durability.. Key Features. Genuin