1990 Mercedes Benz 300e

Electrical problem
1990 Mercedes Benz 300e 172000 miles

I have a 1990 Mercedes 300E. Just recently my fuel gauge, engine temperature gauge, and my RPM gauge on my dash board stopped working. My miles per hour, my milage, and the dashboard clock still works. Any idea what could be wrong? My alternator recently broke and had to be replaced and these problems started right before my it gave out. Any suggestions?
August 9, 2010.

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