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Well, like I said I'm not sure on a 140 how you dim the dash lights, but I do KNOW they are adjustable, so maybe yours are turned all the way down by accident. Some MB's of that era use 2 buttons, usually a plus on one and minus on the other (+/-) which you push the plus for brighter and minus for dimmer. But I'm more inclined to think it uses a rotary button. Usually it's the same or similar button like you use to reset the trip meter. Just try turning the knob you push to reset the trip meter, or if there is more than one of these sticking thru the instrument cluster or bordering the cluster try rotating it, clockwise is usually brighter, counterclockwise is dimmer, just like many other cars.
Gilly
PS if I am correct you'll even see "fluting" on the edge of the knob which makes it easier to grab on to to turn it.
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