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MPGuino is a fairly basic gauge that offers instant & resettable average fuel consumption. It was originally designed by forum members for pre-OBD-II cars, but it also works best on OBD-II cars with lean burn. It requires you to wire it in (splicing into an injector wire; power & ground; vss). You will also have to calibrate it (though you would probably have to calibrate your SG2 somewhat too).
I'm not up to date on what MPGuino kits/completed units are currently available - some members sell them directly (it's not available from EcoModder). You'll have to find the thread in question in the MPGuino subforum.
You're right that it doesn't have the other functions of a ScanGauge, but the SG will drive you bananas because it just won't be very accurate, MPG-wise.
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