ORIGINAL: mopar2ya
Seems I remember seeing somewhere that you could calibrate the speedo through the computer. Check your manual and if that fails try your dealer. Let us know what you come up with. If I get the time and remember I will try to check into it also.
Unfortunately, with SEs, he'll undoubtedly have to go to the dealer. There are no controls for doing any programming of the computer like there are on SRTs.