06326-ZY3-802AH Digit Spd/Tach Hrns - Overview. The 06326-ZY3-802AH Digit Spd/Tach Hrns is an essential wiring harness specifically designed for Honda marine engine systems. This harness supports the digital speedometer and tachometer system, providing reliable and precise data transmission from the engine to the digital gauges. Purpose-built for optimal integration with Honda's marine engines, it ensures seamless connectivity and accurate readings, maintaining your boat's performance and safety