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

Racor Vacuum Gauge with Stainless Steel T-Handle - RK19671

Moeller Reed Switch Tank Sending Unit

Racor Vacuum Gauge - RK19669

Maretron Fuel Flow Sensor

Raritan Ruddermaster Rudder Angle Indicator Kit

Seachoice Fuel Sender Reed Switch

Blue Sea Systems VSM 422 Vessel Systems Monitor Tank Sender

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

Moeller Electric Sending Unit with Return - 035724-10

Moeller Electric Fuel Level Sending Unit - 035722-10

Racor Replacement Water in Fuel Detection Kit - RK30880E

Raritan Ruddermaster Panoramic Rudder Angle Indicator Meter

Faria Water Temperature Sender

Raritan Ruddermaster Sender Assembly

VDO Marine Oil Pressure Sender - 360-410

SeaStar Teleflex Oil Pressure Sender - 18-5899

Racor Pressure and Vacuum Gauge - RK19667

SeaStar Teleflex/Sierra Water Temperature Sending Unit - TS26621

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

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

Raritan Ruddermaster Actuator Rod Assembly - MKDRW

Raritan Ruddermaster Panoramic Rudder Angle Indicator Kit

SeaStar Teleflex/Sierra Universal Fuel Sender - 90424P

Raritan Ruddermaster Sender Lever - MKSL

Seachoice Fuel Tank Sender

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

Faria Cylinder Head Temperature Sender - 90405

Raritan RudderMaster Calibration Box - MKCB

Raritan Ruddermaster Sender Potentiometer - MKSP

Seachoice Marine Speedometer Pitot Kit - 15391

Faria Universal Pitot Kit - 91106

Faria Blank Gauge Fill

Seachoice Pitot Tube - 15401

Sierra Pitot Tubing - 100' - 56353P

Arco OEM Repalcement Outboard Motor Ignition Sender - IG001

Arco OEM Repalcement Trim Sender - TS001

Faria Blue Gauge Replacement Bulb (2-Pack) - 2" - KTF052

Raritan RudderMaster Potentiometer - MKCBP

Raritan Ruddermaster Rudder Angle Indicator Meter

Raritan Ruddermaster Rudder Angle Indicator Repeater

Raritan Ruddermaster Panoramic Rudder Angle Indicator Repeater

Seachoice Pitot PVC Tubing - 15381

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

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

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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