Audio Systems: installing a cassette deck, decent speakers, cassette adapter

Question
i want to connect my mp3 player and i have a cassette adapter that will work, but i do not have a cassette player in my 1998 saturn. i was wondering if you could help me instruct me on how to install a cassette deck so i can use my adapter. there is no currently no deck in the car, only a radio, but decent speakers.

Answer
not a good idea stay away from cassette adapters
buy any other radio a cd player with aux input or a tape player with aux input or get the original satur radio with cd and cd changer controls that way you will be able to plug the ipod in to the radio

cassette adaptor void your warranty on any tape radio
good luck