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I would think the HU was the master. My hopes (and that's all they are right now) is to have some software running on the car PC that will send the signal to the canbus, displaying info on the dash info panel. I would assume we would also need a hardware interface for the canbus. I have a lot more reading to do on canbus and ODBII stuff. FYI, I bounce between Cardiff (home) and Rancho Bernardo (work). Are you going to the SoCal Meetup in June? I am trying to plan a more San Diego centric get together too this summer...
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