There are ways to refresh the interior of the car. A few years ago, I took
out the dash, door panels, carpeting, etc., and dyed everything.
Black: use SEM Landau Black 15013 after the SEM plastic and leather prep (or maybe dye with ForeverBlack)
Red: I used SEM Portola Red 15363 (some use another); for plastics, use SEM plastic and leather prep first
Red for carpets: I cleaned, treated and dyed some tan floor mats that came out well. I used RIT Cherry Red liquid dye.