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

Racor Vacuum Gauge - RK19669

Blue Sea Systems VSM 422 Vessel Systems Monitor Tank Sender

Faria Water Temperature Sender

Maretron Fuel Flow Sensor

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

VDO Marine Oil Pressure Sender - 360-410

Racor Replacement Water in Fuel Detection Kit - RK30880E

Moeller Electric Fuel Level Sending Unit - 035722-10

Moeller Electric Sending Unit with Return - 035724-10

Seachoice Fuel Sender Reed Switch

Faria Dual Station Temperature Sender - 1/8" - 90406

Arco OEM Repalcement Trim Sender - TS001

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

Faria Cylinder Head Temperature Sender - 90405

Faria Blank Gauge Fill

SeaStar Teleflex/Sierra Water Temperature Sending Unit - TS26621

Sierra Volvo/Penta Temperature Sender - 18-7647

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

Racor Pressure and Vacuum Gauge - RK19667

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

SeaStar Teleflex/Sierra Universal Fuel Sender - 90424P

Seachoice Fuel Tank Sender

Seachoice Marine Speedometer Pitot Kit - 15391

Seachoice Pitot Tube - 15401

Sierra Pitot Tubing - 100' - 56353P

Faria Universal Pitot Kit - 91106

Arco OEM Repalcement Outboard Motor Ignition Sender - IG001

Seachoice Pitot PVC Tubing - 15381

Sierra Volvo/Penta Temperature Sensor - 18-7513

Sierra Pack O' Pitots (12-Pack) - 59677P

Osculati Mechanical Fuel Level Indicator - 52.037.00

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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