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Brain just used an MPGuino and just waited for the MPG jump up.
I guess being OBD2 I am somewhat spoiled with being able to watch the rear o2 drop to zero on the scan gauge.
If it were me, I would follow the instal steps of the lean burn light. It is the cheapest option if that is the only thing you want to monitor.
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The problem with the LED though is you are likely going to crave more data. I was driving the other day in lean burn and had the idea to change the backlight coller of my scangauge2 to red to match my MPGuino. I started navigating to the edit display functions and and then freaked out. What was my LOD? What was my TPS? Even though I have a tach, I still trust the scangauge for the accruate readings! It was like driving blind. How could I stay in lean burn without knowing these things! I quickly changed back to the gauge funtion to moniter lean burn. It is crazy how dependant I have become on scangauge and seeing my results.
Now on to your OBD1 situation, Originally I was a fan of the scangauge or ultragauge. Had I bought a VX or swapped in a D15z1 into my car, I would have picked up a OBD2 conversion harness to be able to use the scangauge I already had. But after seeing the torque ap with bluetooth (and being on sprint with unlimited data), I am likely to go that route in the future.
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