1991 Mercedes Benz 300e

Electrical problem
1991 Mercedes Benz 300e 6 cyl Two Wheel Drive Automatic 141370 miles

I recently picked up a 1991 300e. I was driving it the other day and when I applied the brakes, the speedometer, tach, and oil pressure gauge all bottomed out. I turned the car off, restarted it and everything was back to normal. But as soon as I applied the brakes again, the same thing happened. The car continues to run, but I lose the gauges. Any ideas where I should start.

Thank you for your help.
June 4, 2009.

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