I'm purely thinking from a marketability standpoint, for a truly marketable product to be sold at a high dollar ($100 is pretty pricey) to have somebody tapping into injector wiring and what not for the install is not going to be a piece of equipment that can be marketed to the masses.
Technical people with some sense of electronics/vehicles will be ok with it but again for a $50 difference they would be more apt to go with a OBD-II compatible product rather then spending a weekend trying to wire the thing into they're car.
I have a lot of respect for what you are trying to do I'm just giving the perspective of a potential customer. One thing that makes scangauge so popular is it's plug and play, stick it in your car, plug in a wire and you're good to go.
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2007 Honda Civic Ex
Second Goal = 50mpg
First goal = 40mpg Goal Achieved 3 tank average over 40mpg
Starting point 30mpg ready...... GO.
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