Yamaha - Thermosensor Assembly Temperature Sensor Component 6D8-85790-00-00. Overview. The Yamaha Thermosensor Assembly 6D8-85790-00-00 is what keeps your engine's temperature in check by monitoring heat levels and sending that information to the system. If this sensor starts to fail, you might see inaccurate readings, warning alarms, or even overheating issues going unnoticed. It plays a critical role in protecting your engine by ensuring the cooling system responds properly. If your temperature readings seem off, this is one of the first components to inspect.. Key Features. • Accurate Temperature Monitoring - Detects engine temperature and relays data for proper system response.. • OEM Fit Precision - Built to Yamaha specifications for reliable performance and easy installation.. • Engine Protection Support - Helps prevent overheating by ensuring accurate temperature feedback.. • Durable Sensor Design - Made to withstand heat, moisture, and harsh marine conditions.. Engine & Boat Co