how to repair a digital speedometer on grand marquis on 2006 Mercury Grand Marquis

every thing eles is working on my 2005 grand marquis except the digital sppedomer. i replace te whole cluster with a used one and still have the same problem. PLEASE HELP. THANK U

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2 answers
Common Problem with these clusters. They can be expertly repaired here:
Scan test of BCM should help.