The mileage is stored on the computer but if you install a new cluster, it will not learn itself to the system. If you buy a used one, it will show the mileage it had before.
And dont forget the remote controled locking module is attached to the speedo.
If you change the speedo you have to change the fob, or change the module.
Btw. Merry Christmas !
Mileage is stored in the cluster, need to send it to Chrysler to have vin and mileage programmed in it. You can reuse the rke module from og cluster to avoid fod issues