I need to dye/paint various interior pieces from tan to black. I need to do the headliner, leather seats, and some plastic trim pieces. What should/can I use to do this? Any help is appriciated.

 

You can dye the plastic pieces and get good results. Forget about doing the headliner and visors. Best way would be to have them recovered. As far as the seats go, the results you get could be good depending on your ability and current condition of the seats, but be warned, expect the dye to wear off on the seating services. If you have used armor all or a similar protectent on the seats then all bets are off.