Can you get the Pi to display anything on the head unit? Maybe the problem is more to do with not displaying data more than not reading it. Sketch is what we call the program we upload to the Arduino to run. What do Pi people call it?

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)