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I've done PLC's/PIC's, LCD's, and I do a lot of general coding for Linux projects; I think I can contribute a lot, but it may have to wait 6 weeks. Anyways, what I need help understanding is how to access the data - that is get the measurements on the wide range of vehicles we want it for. I do not know cars yet!
Can we gather the information directly from gauges already installed? Which are best to read from? Will they all be sending the same conditioned signal - that is, the same voltage range scaled the same amount? If not then we need some rudimentary way of calibrating it, which would be easy for mileage but harder for fuel.
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