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Jose,
For the beginning you don't have to change MPGuino to get metric code working or to upgrade any code. First we need to get it work just for a proof of concept.
For conversion unit I think the best would be to use ATtiny. It's small, energy efficient and it can be fitted anywhere.
Then you can try to rebuild your MPGuino to get any code you want working and with conversion unit attached.
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Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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