Hi everyone, new here.
just purchase a 2003 OEM touch screen navigation from someone. I have 2003 lincoln Navi Ultimate. What do I need to make it work. Dealer is being a jackass. tells m to get aftermarket. Which Current Disc and where to find gps antenna. I can install myself. Any suggestions? Thanks in advance.:)

the dealer wasnt being a jackass, it is ALOT easier to install an aftermarket unit... your setup will require a new wire harness, etc.

Unless yours had the Navi from the get go it is a major deal to add ,after the fact.

Aftermarket units are designed to work with the standard harness.