Good question. It was touched on in a recent thread, but no specifics about why.
Trivial question: What other cars used reverse speedos?
When people ask, I just tell them that the speedo needle spends so much time over on the left side, it's easier to catch a glimpse of your speed out of the corner of your eye. You'll get some "OKs and head nods" with that one...even though it's BS.
