This was my initial attempt and adding a low fuel light to the Gooster. All the calculations, circuit diagrams and veroboard layouts can be found here. It’s just a shame it didn’t work as expected! The theory behind it all is sound, so it may be of some use to someone...

LOWFUEL LIGHT II - LOWDUINO

The second attempt at a low fuel light - and it’s a bit more complex. It uses an Arduino microprocessor to not only turn on a lamp when the fuel is low, but also acts as an electronic ‘baffle’ for the fuel gauge - stopping the needle wanging all over when fuel sloshes about.