Espruino Wifi v1.1

I'm not 100% sure I understand - usually you would do:

            ____                        ____
-----------|____|--------------|-------|____|--------- 3.3v
 GND       Sensor              |       20 Ohm
                        Espruino Analog

Is that what you had planned? The only things I would suggest are:

• Use twisted pair cables to the sensors, to reduce noise
  

• Put a resistor and large capacitor (10uF?) between GND and the analog input, near the Espruino board. The fuel sensor value won't move quickly, and the capacitor will help to stop noise being transferred to Espruino.

          ____                        ____
  -----------|____|--------------|-------|____|--------- 3.3v
  GND       Sensor             _|_      20 Ohm
                            | |
                            | | 
                            |_| 1k Ohm
           10uF              |
           | |               |
  -------------| |---------------|
  GND         | |               |
                      Espruino Analog