The blue velour interior is unmodified save for a newer aftermarket headunit, and has been maintained by a professional detailer for weekend use. (bringatrailer.com)
The large Ford dealer I bought it from was just going to put a new headunit in it. (thetruthaboutcars.com)
It is basically going to take the high - level outs from the stock headunit and convert to a level appropriate for feeding amplifiers. (mechanics.stackexchange.com)