Megasquirt Fuel Level Gauge
This is the wiring diagram that is needed to add a fuel sending unit to your MS3 or higher ECU.
I checked the resistance of the sending unit to see the range of the sensor. from there I adjusted the values in the Generic Sensor Input window to get them set to where it looks right as it shows in the video.
Here is my Generic sensor input window with my values for the Fuel Level gauge.