In all clusters the mileage is stored in the cluster. It may be stored in the PCM too, but it will not override the mileage in the cluster. It will have to be programed somewhere. I got mine from the dealer and it came pre programed out of a place in California. I think.The mileage is stored in the PCM. It's just plug and play. Only the SVT's store the mileage in the cluster itself.
I just called a local dealer and they'll charge me $62.00 for a reprogram.
Pretty good considering I got the cluster itself for only $25.00!!