dash instruments on 1996 Mercedes-Benz E320

My dash instruments don't always work, sometimes when I start my car they work and sometimes they don't, what could be the problem?

You could have a failing dash cluster or failing power supply to it.
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Have you seen any relationship to dash cluster and ecu or some were in between have same intermittent issue with dash cluster just had starting meltdown would not start needing a tow and once it got there turned key dash worked and started right up so ? Is this actually an ECM module problem?