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If you're using flow meters there are two things that you have to focus on. First is counting pulses, because one pulse is a fixed amount of fuel. So if you know pulses count you'll know the amount of fuel going through flow meter. If you subtract pulses from flow meter on a return line from pulses count on a feeding line you'll know the amount of fuel used by the engine. If you want to have instant FE reading though you have to count time between pulses, then you'll know the exact fuel flow.
So you'll need to connect two separate lines to arduino from both flow meters and a VSS signal.
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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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