On a positive note, grey is by far the most common interior color on the 2nd gen rams so parts are plentiful! If your tan interior is in good condition, I would wager that you could sell it for a tiny bit more than you could buy the grey set for. As DD94 said the dash is a royal pita, the carpet isn't too bad once you have everything else out. If you are stripping it down that far I recommend laying down a sound deadening material before you install new carpet.