2000 Olds Alero 3.4 v6.
Question: all the gauges just stopped working have checked fuses.

Answer:
If there were other electrical problems with the car, i would suspect a bad ignition switch or fuse
block/junction block problem. But this would have to be a problem in the PCM, the Class II data
wire from the PCM to the cluster, or an internal cluster problem.

Gauges are sent data on the Class II line and the cluster interprets the data. A scanner that can
read inputs to the cluster would be need to see if the PCM is sending data. And diagnosis of the
data line for an open or short to ground.

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