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

Raritan Ruddermaster Rudder Angle Indicator Kit

Raritan Ruddermaster Panoramic Rudder Angle Indicator Kit

Maretron Fuel Flow Sensor

Raritan Ruddermaster Rudder Angle Indicator Meter

Raritan Ruddermaster Rudder Angle Indicator Repeater

Raritan Ruddermaster Panoramic Rudder Angle Indicator Repeater

Raritan Ruddermaster Sender Assembly

Raritan Ruddermaster Panoramic Rudder Angle Indicator Meter

Racor Pressure and Vacuum Gauge - RK19667

Raritan RudderMaster Calibration Box - MKCB

Racor Remote Vacuum Gauge - RK19668

Racor Replacement Water in Fuel Detection Kit - RK30880E

Racor Vacuum Gauge with Stainless Steel T-Handle - RK19671

Blue Sea Systems VSM 422 Vessel Systems Monitor Tank Sender

Arco OEM Repalcement Trim Sender - TS001

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

Sierra Pitot Tubing - 100' - 56353P

Moeller Reed Switch Tank Sending Unit

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

Sierra Volvo/Penta Temperature Sender - 18-7647

Arco OEM Repalcement Outboard Motor Ignition Sender - IG001

VDO Marine Oil Pressure Sender - 360-410

Raritan RudderMaster Potentiometer - MKCBP

Moeller Electric Sending Unit with Return - 035724-10

Seachoice Fuel Sender Reed Switch

SeaStar Teleflex/Sierra Universal Fuel Sender - 90424P

Raritan Ruddermaster Actuator Rod Assembly - MKDRW

Seachoice Fuel Tank Sender

Raritan Ruddermaster Sender Potentiometer - MKSP

Faria Universal Pitot Kit - 91106

Seachoice Pitot PVC Tubing - 15381

Raritan Ruddermaster Sender Lever - MKSL

Moeller Electric Fuel Level Sending Unit - 035722-10

SeaStar Teleflex Oil Pressure Sender - 18-5899

Faria Cylinder Head Temperature Sender - 90405

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

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

Sierra Volvo/Penta Temperature Sensor - 18-7513

Faria Water Temperature Sender

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

SeaStar Teleflex/Sierra Water Temperature Sending Unit - TS26621

Seachoice Marine Speedometer Pitot Kit - 15391

Faria Blank Gauge Fill

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

Seachoice Pitot Tube - 15401

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

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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