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2000 Grand Marquis humming in dash

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Just purchased the Merc with 30K miles on it and it has been sitting for a year or so with little to no use.  A few electrical gremlins ( battery, cam sensor, and others ) to correct some issues. What's got me crazy is that above 60 mph or so there develops a ' humming ' in the dash cluster area.  Thought it might be speedo cable until I realized it's electric.  Wondering if it's a vibration from something being loose in a panel somewhere.  Car was never tampered with as it was owned by my 80+ yr. old neighbor who has since past. Any thoughts or similar experience ?


Please let me know,


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