Grounding the gauges

Stevemac10

Not-quite-so-new-guy
Feb 25, 2017
5
1
Nc
Need help with gauge gremlin. Sometimes when I turn my headlights on the gauges peg out and the gauge lights don’t come on.usually I hit the bottom of the dash To get them working.so I figure a bad ground. but I can’t seem to locate where the bad ground is. I’ve ran isolated grounds for the lighting circuits . No help also I’m getting engine noise in my speakers That is something new! Thanks for any help
 

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