Disassembling speedo, changing faceplate, KZ 1000

Once you make the slit, the ring will want to come off almost by itself. It's easy not to bend it. The hardest part is in finding a large enough hose clamp that the speedo will fit inside.

Not sure if it was mentioned yet in this topic, but the following link shows an alternate way to disassembled the meters. The method does cause some marrring, but the chrome meter covers I linked previously could be used on some models to hide the flaws (mostly 70s models).

WGCarbs - wiredgeorge - Gauge Glass Cleanup
Note: the article includes a link for re-calibrating a BMW speedometer.

I did my tach the way described in wiredgeaorge's post, but I didn't do as good of a job crimping the ring back together. I found it pretty difficult. I have it back together but it looks very crappy. Of course the chrome rings you suggested would be a solution!
When I did the speedo, I cut the ring and that worked better for me, however may due to my lack of "crimping patience"

Something that might help in minimizing some of the scratching when re-installing the ring would be to use a protective plastic ring cut out from a plastic milk jug. At the least it may cut down on the top side marring. It might be slippy-slidy, though. I used milk jug plastic as rim protectors the 1st time I changed a tire - the plastic is tough & it worked.