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first pic my first fuel computer circa 1977. used magnetics on the drive shaft and a little pancake shaped fuel meter with a circular groove inside running horizontal around the groove was little black ball about 1/4 " in diameter each time the ball went around it traveled between a light and a light pickup. counting the fuel volume. it works well till the ball turned to gue, from the fuel. worked on any engine that didn't have a fuel return.
next pic the new computer i just got working, works on any mfi engine, uses vss signal and pulse width to compute current economy.
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