That red fuse is not used on '93 and up models.
I do see it on the earlier 124s schematic.
Here is the CD/schematics so you can check that info.
You can also see there are two other fuses in the Fuse box to check.
My guess is you have a bad Reostat..just jumper those two pins to find out.
That is also on the schematic..click on Instrument Cluster104 , Schematic 54-3.00/1..location 33A. The reo is R1 and has terminals 58 and 58D..those are where you jumper.
http://mb.auto.pl/component/option,com_wrapper/Itemid,62/