[W126 Coupe] Grin from ear to ear

[Divov]

Just come back from test driving my 500SEC (Euro) after fitting the diff from a W116 350SE.
That's a 2.11:1 changed to a 3.27:1 if my memory serves me right.
What a phenomenal difference! 
Feels like someone fitted half a dozen turbo's!
What do you do about the speedo now?
I don't care that it reads gibberish but I'm scared to break it when I wind it so far off the clock.
Any advice???
Regards
Alec D.
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