278000965 Temperature Sensor for Sea-Doo Speedster 800 1998-1999

Temperature Sensor for Sea-Doo

This temperature sensor, OEM cross-reference 278000965, reports engine coolant temperature so your gauge and overheat warning work correctly on the water.

Overview

This temperature sensor is a replacement sending unit for Sea-Doo watercraft, cross-referenced to OEM number 278000965. The temperature sensor feeds coolant temperature data to the gauge and warning circuit so overheating is detected early. It fits riders servicing a Speedster 800 or similar Rotax-powered boat.

Built For Performance

• Cross-references OEM part number 278000965
• Threaded body for direct installation in the engine coolant circuit
• Sealed electrical connector resists water and spray intrusion
• Thermally responsive element delivers stable signal output
• Compact body sized to clear surrounding engine components
• Suits marine use where corrosion resistance matters

Fits These Machines

• for Sea-Doo Speedster 800, 1998-1999
• for Sea-Doo models using OEM 278000965

On-The-Job Use

• Replacing a failed or erratic temperature sender
• Restoring accurate coolant temperature readings on the gauge
• Routine cooling system maintenance
• Overheating diagnostics and repair

Specs At A Glance

Good To Know

Q: How do I know if my temperature sensor has failed? A: Common signs include a gauge that never moves, reads erratically, or triggers false overheat warnings. Testing resistance across the temperature range confirms whether the sender is still within spec.

Q: Does this sensor include the electrical connector? A: The sensor is supplied as the sender unit shown, matching the OEM 278000965 connection point. Reuse your existing harness plug unless it shows corrosion or damage.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.