speedometer not working

Hello all ! I got a smart 451 2008 , and last night when I took my car from work my speedometer was not working ! So I cannot see how much I have gas left or anything !

First thing in the morning I've check all my fuse but they are all working !

I've went to my dealership and they cannot check my car until the 19th of August!

I need to find out what could be broken ? Or is it possible that its just unplug ?
Because my power window are working my radio too ?

Do you guys have any idea what it could be ?



Thanks !