2007 Ford Fusion Instrument Cluster mismatch with computer

Sir or Ma'am,

My 2007 4 cycl automatic transmission Ford Fusion with 140K on it (yes I do lots of driving) had the instrument cluster assembly go bad. I did have the problem diagnosed by a Ford dealership and was told I need to pay $1000.00 for a new instrument cluster to be installed (including labor). I did not have 1K for an instrument cluster so I bought a used one from InstrumentClusterStore. Com. I have received the new used unit and plugged it in to my car. All previous problems dissapeared, and a new problem came up. My car will not start with the new instrument cluster installed. When I install my old bad part, my problems return (all instruments and lights flicker continuously), but my car will start.

The new part is an exact match to the part which was removed, furthermore it has been tested and it is a known good part. With the new part installed, the anti-theft light illuminates and will not go out until I remove the key from the ignition. I believe since the mileage on the new instrument cluster is different from the mileage on my old instrument cluster the car has 'locked me out' and my car's computer is preventing my car from starting due to the mismatch.

How do I completely reset my car's computer?
How do I calibrate the new instrument cluster?

Thank you in advance for considering my question.

Charles R.
Brea, California