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Ok, sounds good. I've got my MPGuino built and I built it modular so I can swap out the VSS+Injector board for a new OBD board. I'm willing to help out as I can.
I'll read through your code soon, but the first thing I noticed at a qiuck glance is that you're using the LCD4Bit library. That library is hard-coded for certain pins on the 'duino (and I believe they're required to be consecutive), but the schematic you have (from the MPGuino) doesn't conform. Unless you have some code to rearrange the LCD4Bit pins, the LCD won't work as wired. I can upload the code to my 'duino tonight to see what happens.
LMK if I'm way off.
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