I've seen quite a few Euro 308s and 328s with the odometer in KM. My early 1986 328 is that way. I think it was up to the importing company which way they wanted to go.
While it may be a little hard to see at 640x480, there is a substantial difference in the facing materials in my speedometer and tachometer. You can definately tell the speedometer has an overlay on top of it and can see some wrinkling around the screws and lower indicator lights. The tachometer has a different texture and looks silkscreened directly onto the metal face. It also reads to 200mph rather than the U.S. spec 180mph. I've seen the same overlay on chassis 59935 as well.