Ugh... I wrote up a lengthy reply and then deleted it to help keep this discussion civilized. If you knew anything about me (which obviously nobody does as I'm new here) than you wouldn't toss around programming and root cause crap in my face. I could talk poor UX, DB and code design all day.

I'll just leave it at this one line of my long reply that I originally wrote -> I have an Audi A4, and the speedo and fuel gauge is on the right, and it makes a world of difference to the "end user" to be able to see the speed quickly when traveling down the road. Given the chance for users to experience speedo left or speedo right, I personally believe the majority would pick speedo right (interesting that Audi interiors win awards every year, and this is what they have chosen.)