1994 c280 Speedometer/fuel gauge/ Tach

[mcgovnor]

About 2 years ago,the speedometer on my 1994 c280 stopped working upon start up. It would then bounce on at speed, only to quit again upon short stops,then come on again. Replaced the dashboard, but problem persisted, and now affects the Tach and fuel gauge, and sometimes the temp gauge. In cold weather it's worse, until reaching normal operating temperature. Tapping the dash sometimes gets them working, until the next stop, but it's an ongoing problem.
Any repair solutions?