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Recently purchased a 99 ws6 everything on the car is in really great condition except the guage cluster is malfunctioning except the volts and oil I believe the guy had got another cluster and it does the same as well if done a little research and checked fuses and grounds any help would be greatly appreciated
 

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Ramblin' Wreck
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The voltage and oil gauges you mentioned are the ones not controlled by the PCM (computer). The other gauges are controlled by the PCM. I suspect the cluster is not getting the Class 2 data signals from the PCM to pin B6 of the cluster. Or It could be instead that the ground at pin B15 of the cluster is not present. These diagrams may or may not help depending on your troubleshooting ability.
228839
228840
 
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