Gauge Components & Senders

  1. Raritan Ruddermaster Rudder Angle Indicator Kit

    $680.99 - $780.99
  2. Raritan Ruddermaster Panoramic Rudder Angle Indicator Kit

    $605.99 - $720.99
  3. Faria Single Station Rudder Angle Sender - 90530

    $438.99
  4. Raritan Ruddermaster Rudder Angle Indicator Repeater

    $303.99 - $383.99
  5. Raritan Ruddermaster Rudder Angle Indicator Meter

    $276.99 - $442.99
  6. Raritan Ruddermaster Sender Assembly

    $269.99 - $370.99
  7. Raritan Ruddermaster Panoramic Rudder Angle Indicator Repeater

    $247.99 - $336.99
  8. Raritan Ruddermaster Panoramic Rudder Angle Indicator Meter

    $195.99 - $280.99
  9. Raritan RudderMaster Calibration Box - MKCB

    $153.99
  10. Marinco BEP Ultrasonic Tank Sender - TS1

    $136.99
    0
  11. Blue Sea Systems VSM 422 Vessel Systems Monitor Tank Sender

    $113.99 - $114.99
  12. Arco OEM Repalcement Trim Sender - TS001

    $76.99
    0
  13. Moeller Reed Switch Tank Sending Unit

    $74.99 - $144.99
    1
  14. Faria Single Fuel Level Sender - 91001

    $74.99
  15. Faria European 5 Bar Oil Pressure Sender - Single Float - 90516

    $69.99
  16. Seachoice Fuel Sender Reed Switch

    $67.99 - $143.99
  17. Moeller Electric Fuel Gauge Swingarm Sending Unit Kit - 035726-10

    $67.99
    0
  18. Arco OEM Repalcement Outboard Motor Ignition Sender - IG001

    $64.99
    0
  19. VDO Marine Oil Pressure Sender - 360-410

    $60.99
    0
  20. Faria American Dual Station Oil Pressure Sender - 1/8" - 90511

    $58.99
  21. Faria Electrical Oil Pressure Sender - 90519

    $52.99
    0
  22. Raritan RudderMaster Potentiometer - MKCBP

    $51.99
  23. Moeller Electric Sending Unit with Return - 035724-10

    $47.99
    1
  24. Faria Electrical Oil Pressure Sender - 90512

    $46.99
    1
  25. SeaStar Teleflex/Sierra Universal Fuel Sender - 90424P

    $44.99
    0
  26. Raritan Ruddermaster Actuator Rod Assembly - MKDRW

    $43.99
  27. Raritan Ruddermaster Sender Potentiometer - MKSP

    $43.99
  28. Faria Depth Gauge Air Temperature Sender - TS0101

    $42.99
  29. SCAD Technologies Adapter Plate - 10029

    $40.99
    0
  30. Raritan Ruddermaster Sender Lever - MKSL

    $36.99
  31. SeaStar Teleflex Oil Pressure Sender - 18-5899

    $35.99
    0
  32. Faria Universal Pitot Kit - 91106

    $35.99
    0
  33. SeaStar Teleflex/Sierra Oil Pressure Sender - OP24891

    $34.99
    0
  34. Moeller Electric Fuel Level Sending Unit - 035722-10

    $32.99
    2
  35. Seachoice Fuel Tank Sender

    $29.99 - $38.99
  36. Faria Cylinder Head Temperature Sender - 90405

    $27.99
  37. Faria Dual Station Temperature Sender - 1/8" - 90406

    $24.99
  38. Faria European Single Standard Temperature Sender - 1/8" - 90412

    $21.99
  39. SeaStar Teleflex/Sierra Water Temperature Sending Unit - TS26621

    $18.05
    0
  40. Faria American Single Standard Temperature Sender - 1/8" - TS1029

    $17.92
  41. Faria Water Temperature Sender

    $16.30 - $35.99
    0
  42. Seachoice Marine Speedometer Pitot Kit - 15391

    $14.34
  43. SeaStar Teleflex/Sierra Sportsmen Series Universal Pitot Tube - 56973P

    $11.29
    0
  44. Seachoice Pitot Tube - 15401

    $9.64
  45. Sierra Fuel Sender Gasket 5-Hole Unit - 64082

    $6.84
    0
  46. Seachoice Fuel Sender Replacement Gasket - 50-15511

    $6.36

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.