Hi Billy,
Best I could find is in the below attachment, part of the Supplement, and advising differences between K models. This is a K2 difference, but moving 'up' through the K3,4,5,6 no further reference made to speedo colours.
As for the battery box, sure I once read somewhere all parts glss black, with the exception of (a very few) ... and not including the batt box.
Cheers,
Lobo