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The black ground wire attaches to both gauges and also to the two   1/8-inch holes previously drilled in the instrument housing. Grounding the instrument cluster to the body is also recommended. Now the cluster and other items previously disassembled can be reassembled.
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The black ground wire attaches to both gauges and also to the two 1/8-inch holes previously drilled in the instrument housing. Grounding the instrument cluster to the body is also recommended. Now the cluster and other items previously disassembled can be reassembled.  View Related Article