Blue Sea 1820 Submersible Temperature Sensor

The Blue Sea 1820 Submersible Temperature Sensor is a reliable marine-grade instrument designed for anglers, boat owners, and water sports enthusiasts who need real-time engine or water temperature monitoring. Whether you're tracking engine heat during a long day on the water or monitoring coolant system performance, this sensor delivers the accuracy and durability required for serious boating applications. Built by Blue Sea Systems—a trusted name in marine electrical systems—the 1820 integrates seamlessly into existing gauge systems and provides instant feedback to help you protect your investment and stay safe on the water.

This submersible temperature sensor features a fully sealed IP68 rating, meaning it can handle complete submersion and harsh marine environments without failure. The compact probe design—measuring just 2 x 1 x 8 inches—allows flexible mounting in tight engine compartments or intake manifolds. Installation is straightforward: the included double-sided tape enables secure adhesion to surfaces, while the flexible dual-wire connection can be wired in either polarity without concern for proper operation. The robust construction ensures years of corrosion-free service in saltwater or freshwater conditions, critical for any angler or boater who demands dependability.

Boaters upgrading their engine monitoring systems or installing aftermarket gauges will appreciate the universal compatibility and plug-and-play design of the 1820. This sensor works across most marine applications—from inboard engines to outboards—and pairs easily with Blue Sea Systems gauges or OEM instrument clusters that accept analog temperature inputs. Weighing just 0.1 pounds and requiring minimal installation effort, it's an ideal upgrade for anyone seeking expanded engine diagnostics or redundant cooling system monitoring to maximize reliability during extended trips.