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The OBC on my '90 325is only shows temp, stop watch and time. The rest of the functions never set(fuel mileage, average speed, etc.) It has been this way since I bought the car last July. Any thoughts as to what is wrong, what I can do to fix it? It's no big deal but I keep thinking maybe I'm doing something wrong and they might really work. I've followed the owner's manual instructions to the letter but no luck.