First thing to check is the dimmer switch, it is the knob which resets the trip odometer and often inadvertently gets turned down. Try turning that and see if that works.

If not, it may be the dimmer rheostat, they commonly go west in cars this age. You will need to pull the instrument cluster to get at this, do a search it has been written up many times.

If it is the globe which feeds the fiber optic - and the fiber optic only lights a handful of switches in the center dash, it is located down behind the ashtray. Remove the ashtray insert, undo the 2 Phillips head screws holding in the ashtray frame and remove and peer down forward, you will see an 'octopus' of fiber optic wires (usually 6) coming out of a unit with a globe in the middle. You need small fingers to replace it - but it is easily done.

However, if ALL your instrument and switch lights are out - and you say the fuses are fine - my bet is either the dimmer knob turned down or a faulty dimmer rheostat.

Hope that helps.

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1988 W126 420 SE

beware of fundamentalists!