If it comes with the harness all you might have to do is change some connectors at the bulkhead connector. A wiring diagram for your year and the donor year will prove invaluable.
I’m not saying this is the legal way to do the VIN tag, but have heard it done this way: cut the VIN rivets from the bottom so that the head remains on the tag. Glue the rivet head to the tag if needed, then lightly glue the VIN tag to the replacement dash frame. Is it legal - probably not.