dash cluster

On my '90 Grand Marquis the odometer just stopped working. The trip-dometer and the speedometer work fine. Just the odometer stopped.
Is the odometer a seperate cluster and be replaced by itslef? Or are all three mileage clusters together.
I have received two different ansers from mechanics. One says he can replace the odometer alone and the other says I need the whole cluster.
Any info on this is greatly appreciated.
Thank you!
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