Sierra Sending Units

When marine engines demand reliable monitoring in harsh saltwater conditions, Sierra delivers precision-engineered sending units that boaters have trusted for decades. As a cornerstone of Sierra's instrumentation ecosystem, these electrical sensors provide the critical real-time data needed to protect your engine investment and avoid costly breakdowns on the water.

Comprehensive Monitoring for Marine Engines

Sierra's sending units cover essential engine parameters including oil pressure monitoring for 0-80 PSI and 0-100 PSI gauges, temperature readings across a 0-240 degree range, and fuel level tracking. These temperature sending units work seamlessly with all Sierra instrument series, including Red International, Blue Vector, White Sportsman and Heavy Duty, ensuring compatibility across the brand's entire gauge lineup. The electrical design eliminates the safety concerns and maintenance headaches associated with mechanical senders, while delivering consistent accuracy in demanding marine environments.

Single and Dual Station Configurations

One distinguishing feature of Sierra's sending unit line is the availability of dual station options for larger vessels. Sierra's dual station oil pressure senders transmit signals from a single engine to two separate gauge sets, allowing temperature monitoring at both upper and lower station gauge panels on larger cruisers. This versatility proves invaluable for boats with fly bridges or multiple helm stations, eliminating the need for redundant sensors while maintaining accurate monitoring at every control position. Single station variants provide straightforward installation for boats with one gauge location.

Engineered for Marine Durability

Sierra Marine is a trusted name in aftermarket replacement boat engine parts, with products designed and engineered to exceed the high horsepower demands of today's engines in the harshest marine environments. The sending units feature NPT threaded connections in various sizes (1/8", 1/4", 3/8", 1/2") to match different engine block configurations across manufacturers. With over 35 years as a leading supplier, Sierra Marine parts are unconditionally backed by their warranty, covering shop labor, haul out and towing fees and all related incidental charges should a warrantied part fail—a level of protection that reflects confidence in long-term reliability.

OEM Replacement Excellence

Sierra sending units serve as direct replacements for original equipment from major marine engine manufacturers including Mercury, Yamaha, Volvo Penta, Westerbeke, and Crusader. Sierra supplies their engine parts to many OEM engine manufacturers and boat builders, demonstrating the quality standards that make these sensors suitable for both maintenance replacements and professional installations. Whether you're maintaining a weekend fishing boat or a commercial vessel, Sierra's sending units deliver the accuracy needed for proactive engine management and peace of mind on extended voyages.