Using an external fuel level sensor, showing a % fuel tank value or a custom volume is entirely possible.
Wiring
Any available analog input, AINx (TEMP) can be used.
In our example we use an 0-90ohm fuel level sensor, and to increase the resolution we add an external pullup resistor in combination with the built-in 2.5k found on AIN (TEMP) inputs.
1. Wire in the sensor as above, but don't forget the external +5V pullup using a ~360ohm resistor, for example 160-59-203 from elfa Distrilec.
2. Enable the wired analog input channel (Inputs --> Analog inputs), but do not activate any Analog input class.
3. Head over to the Advanced --> User tables, and enable one of your choice. Enter a good name and a proper unit name, calibrate min/max voltages. Using a 360ohm resistor as in our example, min voltage is 0.020V and max voltage is 1.118V.
4. The user table value is now available within the whole MaxxECU system, and visible also in the MDash Android app.
Example
In our example, we used the fuel level sensor (SPDTG090) from Swedish speeding.
Connect MaxxECU Sensor GND to the pin marked "G" and any available analog temperature input, marked AIN x (TEMP) to pin "S".
A resistor between 300 and 400ohm would be fine, just remember to recalibrate the sensor endpoints properly.
Use an appropriate shrink hose with glue after the resistor has been soldered to the wires.
Example fuel level installation with three wires to connect +5V sensor supply, Sensor GND, and analog temperature signal.
