NMEA2000 Multi-Function Tachometer - Wema UK
NMEA2000 Multi-Function Tachometer - Wema UK
NMEA2000 Multi-Function Tachometer - Wema UK


NMEA2000 Multi-Function Tachometer

Regular price£238.80
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The NMEA2000 Multi-Function Tachometer is invaluable if you want to see how your engine is running. 

The gauge checks idling, normal running and peak load.

Also useful when choosing the right propeller and for the maximum fuel economy.

The Wema NMEA2000 Multi-Function Tachometer can replace NMEA2000 OEM tachometers. 

The sunlight readable LCD display can show fault codes, alarms, engine hours, fuel consumption among other things.

Delivered with one 1m NMEA2000 drop cable/back bone cable with female and male connector.


    • Engine RPM
    • Trim/tilt
    • Fuel rate (LPH or GPH)
    • Fuel level
    • Engine temp (Celsius or Fahrenheit
    • Oil Pressure (BAR or PSI)
    • Engine total hours
    • Battery voltage
    • Alarms
    • Check engine
    • High temperature
    • Low oil pressure
    • Charge indicator
    • Maintenance needed
    • Low oil level (in oil tank)


    • NMEA2000 Multi-Function Tachometer
    • Model: Silverline gauge with, stainless steel, slim bezel, acid resistant
    • Output: NMEA2000
    • Cable and connector: 1000 mm +/-30 mm with NMEA2000 Micro male
    • Working range: 7000 rpm
    • Blue backlight
    • Operating temperature -25 to +70°C Waterproof, IP67
    • Resistant to ozone, UV and saltwater Fully corrosion protected
    • Power supply: 12 V
    • Power consumption: 140 mA
    • Drill hole: 85 mm
    • Outer dimension: 97 mm
    • Depth: 60 mm

To supply a replacement fuel or water sender we just need to know:


  • What is the Wema product code?

If your sender has information stamped on the head then we can identify your sender from the product code:

 Identifying a Wema sender

[Please note: the code 001300 refers to the S3 head and the code 001306 / 001305 refers to the S5 sender head]


Do you have an S3 or S5 sender?

The S3 has a screw in head with a 1.25" BSP thread like this:

[NOTE: A 1.25" BSP (British Standard Pipe) thread will actually measure larger than 1.25 inches when measured with a tape measure.  This is because a BSP measurement refers to the internal bore of a pipe (for accurate flow rate) and not the outside of the thread.] 

Wema S3 sender head

The S5 has a bolt down head with 5 holes like this:

Wema S5 sender head


[NOTE: The 5-hole drill pattern in the top of an S5 sender head is a standard SAE-5-hole pattern.] 


If you have a sender that is not an S3 or S5 then please click here


What resistance is your current sender and gauge?

The sender and gauge must have the same resistance values or the gauge will read incorrectly.

You can either test the gauge or the sender to find this out.


To test the sender:

  • Disconnect the two wires on top of the sender.

  • Remove the sender from the tank.

  • Connect the wires on the sender to a multimeter. 

  • Set the multimeter to resistance [Ω ohms]

    How to test a sender - Wema

  • Move the float to the top of the sender and take a reading on the multimeter:

    • At the top of the sender (full) the resistance should be:

      • European specification - 190 ohms

      • American specification - 30 ohms

  • Move the float to the bottom of the sender and take a second reading:

    • At the bottom of the sender (empty) the resistance should be:

      • European specification - 0 ohms

      • American specification - 240 ohms 

To test the gauge:

 If you have access to the wires on the back of the gauge;

  • Power the gauge off

  • Disconnect the black wire (sender) 

  • Power the gauge on

  • If it's an American gauge the needle will show EMPTY

    • Touch the black wire to earth, the needle will go to FULL

  • If it's a European gauge the needle will show FULL

    • Touch the black wire to earth, the needle will go to EMPTY

If you don't have access to the back of the gauge;

  • Disconnect the two wires in the loom that attach to the sender.

    • If it's an American gauge the needle will show EMPTY

    • If it's a European gauge the needle will show FULL


To measure an S3 or S3H sender (with screw in head) measure from the top of the thread to the bottom of the stem.

How to measure Wema S3 sender

To measure an S5 sender (with bolt down head) measure from the underside of the flange to the bottom of the stem

 How to measure Wema S5 sender


How many wires?

If your S5 or S3 sender has 2 wires then it is a standard resistance sender.

If your S5 or S3 sender has 3 or 4 wires then it is either a 0-5v, 0-10v sender or it has a high/low level alarm.

If you have a 3 or 4 wire sender then please contact us before ordering.

If your sender has a high or low level alarm we will need to know if the switch is normally off (when the tank is empty), turning on when the tank is full or normally on, turning off when the tank is full.  We will also need to know how far from the top or bottom of the sender you would like the alarm switch to be.


Tank Contents?

For fuel or water then you can fit the maximum length of sender for your tank.

For a black water holding tank we recommend leaving at least 50mm from the bottom of the tank regardless of the material the tank is made from.

If you tank does not contain fuel, fresh water, grey water or black water then please contact us for more specific information.  For very thick liquids like oil or grease we may need to know the viscosity.


Wema Sender Identification Chart 
    (click here for larger view)

Wema Sender Identification Chart 


NMEA2000 Products