I think you need to check for applicable trouble codes, first. Some of the national brand autostores will check codes for free. Several of the sending units send signal to pcm, the pcm sends class2 data to the instrument panel cluster.
You can check fuses for the instrument cluster and you can check ground. The ground wire is black with white tracer. The fuses are in the diagram.
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Tuesday, March 19th, 2013 AT 10:03 PM