I have a friend with a '91. His tachometer works, the speedometer works, but the odometer doesn't display anything. Is it likely just a bad guage cluster? Since the odometer number is stored in the CCM, wouldn't replacing the cluster NOT affect the mileage?

Where can you get a new or used guage cluster, and how much are they?

He said he believes that a previous owner replaced the PCM, but I don't think that would affect the odometer (right)?

Thanks for the help!