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It's $55, you can buy it from dcb here on this site (search for the MPGuino threads), and there's a ton of info on here from others who have installed them. Basically a battery wire, a ground wire, a fuel injector signal wire and a speed sensor wire give it everything it needs to track your mpg. If you take a look at the MPGuino wiki link it has some basic starter input values for the 'guino that you can recalibrate as you go thru a couple tanks. Works like a charm once you get everything dialed in to your car's distance/fuel signals, you can easily track lean burn mode then.
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