i wanna put a digital instrument cluster in my 2003 ford f150 and i was wondering how do i go by doing that do i get one for a mustang and use it or do i buy one custom made for it

 

This not an easy task.... and IMO not worth the effort.

1) No aftermarket clusters, to my knowledge, were ever made for Gen 10's
2) Your PATS (security) system is ran through it, and is all programmed as a unit with your key
3) Your mileage will not transfer over, as it is stored in the cluster.