I believe your car is older than my 86' W126. All you need is to tell the dealer to remove the factory system and label the harness as which goes where, speakers, antenna....etc. Or you could ask anyone with audio skill to do that for you. It's pretty simply in the older cars. With the factory Becker off, I put a new one in about 15 minutes. And I don't think there's amplifer in there at the time. At least there isn't one in my 86.