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I RECENTLY CONVERTED MY SWEEP DASH TO A FULL GAUGE SS DASH OUT OF A 70.I REPLACED THE DASH WIRING HARNESS WITH A NEW 70 FULL GAUGE HARNESS BUT CANT GET ANY OF THE GAUGES TO WORK, EVEN THE WIPER SWITCH DOESNT WORK. DO I NEED TO REPLACE THE UNDERHOOD HARNESS ALSO? PLEASE HELP!! ERIK
 

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Erik

Welcome to Team Chevelle. It's usually considered YELLING when you have the caps lock on.

It is likely the cluster grounding that is the problem. There are three black wires with ring terminals that are for grounding .The longest one attaches at the parking brake bracket. The other two attach here (wiper switch headlight switch) and here cluster.

The assembly manual shows the cluster ground wire attached at the clock either place works.
 
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