Mercedes Benz repair: Mercedes Benz 1992 500 SEL, water gage, toronto ontario canada

Question
Hello again
I tested all the ground connections and also add another new wire to the ground and all the ground terminals to the body were factory solder and very clean .all the fuses were clean and shinny
Still problem is there.
Only water gage works no other gages are working
Any ides .What equipment is controlling the gages .Is it on board computer?
Any recommendations are highly appreciated. I am in Toronto/Ontario Canada

Rgds
Moji
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Followup To

Question -
Hello
I have 1992 500 SEL after storage and charging battery I noticed the instrument cluster gages do not work anymore. Only temperature gage works
Any idea what could have been going wrong? Could charge voltage exceed the voltage on the electronic parts?
Car starts and work fine but no instruments
Many thanks In advance
Moji

Answer -
Answer:
#1. A corroded ground point.
#2. Corroded fuses.

Where are you?

Replace ALL fuses with new and retest.

Answer
This may be a bad cluster, however, I still suspect corrosion.
You need hands on help.
Hy best suggestion is to search through the following thread for a good MB shop near you.
Note:
You may find a member near you who can help also.

Canada
http://www.mercedesshop.com/shopforum/forumdisplay.php?f=34