speedo &tripmeter

[kemp2368]

hi all,ive got a w202 c280 1995,yesterday the speedo and tripmeter stopped working,after i had new stereo fitted,
also the dash has been changed from kmh to mph so is it poss that the speedo cable has come loose
thats if it has a cable?? as this is my first Mercedes-Benz i dont no
and what is the procedure to get to the cable ??
thanks
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1995 c280 auto

im trying to find out what and why it has happend when changing the stereo any ideas
is it a case of resetting something?
its really annoying as only had car 3 days and everything apart from this is great,already in love with it(but dont tell the wife)