White seems to endure the sun the best, so you have that going for you. Like mentioned above a dash cover helps, I've had one on since new, 30 years ago and I also always, always, put a sun shield in the windshield, dash still looks new.
On my Google Drive, let me know if you have problems getting them.
Technical Manuals
84-93 FSM
88 FSM
Transmission Manuals
88 MJ Electrical Manual
87 MJ Electrical Manual
87 MPI Injection
RENIX MPI Manual
91 Sequential Fuel Injection Manual
Part Catalogs
81-86 Parts Catalog
86-87 Parts Catalog
87-90 Parts Catalog
87-90 Parts Catalog version2
91-93 Parts Catalog
94-96 Parts Catalog
Crown Parts Catalog
MJ Parts List
Mopar Performance Catalog