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The three sections of the gauges assemble one over the other through the back of the cluster. The ground is made through physical contact and often just needs a loosening and retightening of the screws. The actual ground is carried through the gauges to the harness that plus in. I have seen the trace burned on the final printed circuit to the plug. I have seen separate ground wires applied under the assembly screws.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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