I saw on the old board that you were looking for a way to hook up you MP3 player to your car.  The suggested methods were OK (I've tried both, never could get the one that encodes to FM and plays through the radio to work though).  But the neatest way is if you can find an auxillary input adaptor for your unit.  I found one for my Dodge and also one for the Kenwood in my 66 Mustang.  They just plug into the back of the unit (where a CD changer or some other input device would go) and extend out to one of those headphone jack receptacles.