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I'm working on an eco light as part of a subsection of the section 'Abusing the Toyota Diagnostic Connector [TDC] for fun and profit'. I think that the diagnostic connector has an output line that just happens to be at a certain voltage when the car is in feedback. It isn't super accurate, but it should help with efficient acceleration. The electronics required to give good enough results for most cases amounts to a N channel mosfet with an appropriate Vgs, a handful of resistors, and a green LED. Simple, easy to read, and you don't need to pull the dash to try it out since the TDC has a ground, a battery positive, and the ECU output lines right there.
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