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

Seachoice Fuel Sender Replacement Gasket - 50-15511

Sierra Fuel Sender Gasket 5-Hole Unit - 64082

Seachoice Pitot Tube - 15401

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

Seachoice Marine Speedometer Pitot Kit - 15391

SeaStar Teleflex/Sierra Water Temperature Sending Unit - TS26621

Faria Water Temperature Sender

Faria European Single Standard Temperature Sender - 1/8" - 90412

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

Faria Cylinder Head Temperature Sender - 90405

Seachoice Fuel Tank Sender

Moeller Electric Fuel Level Sending Unit - 035722-10

Faria Universal Pitot Kit - 91106

SeaStar Teleflex/Sierra Oil Pressure Sender - OP24891

SCAD Technologies Adapter Plate - 10029

Raritan Ruddermaster Sender Lever - MKSL

Faria Depth Gauge Air Temperature Sender - TS0101

Raritan Ruddermaster Sender Potentiometer - MKSP

SeaStar Teleflex/Sierra Universal Fuel Sender - 90424P

Moeller Electric Sending Unit with Return - 035724-10

Raritan Ruddermaster Actuator Rod Assembly - MKDRW

Faria Electrical Oil Pressure Sender - 90512

Faria Electrical Oil Pressure Sender - 90519

Raritan RudderMaster Potentiometer - MKCBP

VDO Marine Oil Pressure Sender - 360-410

Sierra Pitot Tubing - 100' - 56353PS

Sierra Volvo/Penta Temperature Sender - 18-7647

Arco OEM Repalcement Outboard Motor Ignition Sender - IG001

Seachoice Fuel Sender Reed Switch

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

Arco OEM Repalcement Trim Sender - TS001

Moeller Reed Switch Tank Sending Unit

Faria Single Fuel Level Sender - 91001

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

Blue Sea Systems VSM 422 Vessel Systems Monitor Tank Sender

Sierra Mercury Outboard Tachometer Harness - IH15105

Raritan RudderMaster Calibration Box - MKCB

Raritan Ruddermaster Panoramic Rudder Angle Indicator Meter

Raritan Ruddermaster Sender Assembly

Raritan Ruddermaster Panoramic Rudder Angle Indicator Repeater

Raritan Ruddermaster Rudder Angle Indicator Repeater

Raritan Ruddermaster Rudder Angle Indicator Meter

Raritan Ruddermaster Panoramic Rudder Angle Indicator Kit

Raritan Ruddermaster Rudder Angle Indicator Kit

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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