Gauge Components & Senders

About Gauge Components & Senders

Marine Senders

Boat sending units are designed to measure the amount of fluid in a tank, boat speed, temperature, and a variety of pressure-sensitive gauges. Senders can be replaced with parts from Defender Marine or full sender kits are also available for a variety of applications.

What is a Marine Sender?

Marine senders, or boat sending units, are designed as a simple measuring device that then relays (or sends) this measurement to a marine gauge.

How do you test a marine fuel sender?

Fuel senders can easily be tested with an ohms tester. A variety of fuel senders are available including level arm, swing arm and solid float, and conventional style float switch type senders; all can be tested by reading the ohms output.

Floatless marine senders measure for many different gauges.

Pitot kits measure a boat's speed while more technological speed sending units rely on GPS to garner a constant speed reading. Temperature sending units from Defender Marine measure up to 300 degrees and relay this back to temperature gauges in many applications. Pressure sensors measure essential pressures such as oil pressure in the engine. Newly designed floatless senders measure tank pressure versus fluid capacity.

Gauge Components & Senders

Moeller Reed Switch Tank Sending Unit

Racor Vacuum Gauge with Stainless Steel T-Handle - RK19671

Moeller Electric Fuel Gauge Swingarm Sending Unit Kit - 035726-10

Moeller Electric Fuel Level Sending Unit - 035722-10

Blue Sea Systems VSM 422 Vessel Systems Monitor Tank Sender

Faria Water Temperature Sender

Moeller Electric Sending Unit with Return - 035724-10

Maretron Fuel Flow Sensor

SeaStar Teleflex Oil Pressure Sender - 18-5899

Seachoice Fuel Sender Reed Switch

Racor Replacement Water in Fuel Detection Kit - RK30880E

SeaStar Teleflex/Sierra Water Temperature Sending Unit - TS26621

Faria American Single Standard Temperature Sender - 1/8" - TS1029

SeaStar Teleflex/Sierra Sportsmen Series Universal Pitot Tube - 56973P

SeaStar Teleflex/Sierra Universal Fuel Sender - 90424P

Faria Blank Gauge Fill

Moeller 5-Hole Fuel Sender Gasket with Mounting Screws - 035728-10

About Gauge Components & Senders

Marine Senders

What is a Marine Sender?

How do you test a marine fuel sender?

Floatless marine senders measure for many different gauges.

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