Update, skip ahead to a working model:
http://www.gassavers.org/showthread....32#post6473232
It seems a simple enough task, take a vehicle speed sensor "reading" and divide it by the injector duty cycle and put it on a meter. In fact my el-cheapo tach/dwell meter has both circuits in it (and a meter) and could be made to reflect vehicle speed (perhaps with an op amp on the vss) or injector duty cycle (which probably isn't much more than an inductor). Throw in some pots for calibration and an op amp to combine the signals and...
So has anyone come up with a simple mpg gauge circuit for the masses? I suppose digital would be better (i.e. keep track of every duty cycle for every vss pulse and add a "trip" type function to it), but I kind of like the "gomi"-ness of dissecting my old tach/dwell meter and making an mpg gauge out of it
Thoughts?
P.S. Scangauge is in my wifes hands and I don't have another $160, that's why I'm considering this
, though something for the DIY sector would be useful.
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