You could write code for all 3 and then switch between them. Sometimes it's hard to tell what looks right until you see it. The lights going all on then sequentially off certainly got my attention like a brake light would but I don't know if I would like that.

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