How are you reading and writing the EEPROM? There are actually two EEPROMs in the '02-'04 cluster, and they are encrypted with a unique key for the processor, so you can't just transfer data from one cluster to another.
I believe the simplest way to convert the cluster would be to put it in a C2 and code it using a Autologic tool (I know that will work) or perhaps a PST-2 or PIWIS.
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'03 S, manual, 18" Carrera wheels, PSM, PSE, Litronic, 996 Cluster, +
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