When I got the car the dash had already been cut up to allow an early 90's Ford radio to fit. Since it looked so out of place I found a factory AM radio and cut the dash a bit more to fit, and it came out great, but because there is hardly any AM stations near me I found online how to easily make it so I can plug my phone directly into it. This is the instructable that I followed to make it work, Adding Auxiliary Input (for an Mp3 Player) to an Old AM Truck Radio
New radio fitted, looks much better than the nasty old Ford one
Very simple install to get it to work took all of 15min and $4 to make it.
Aux jack is wired directly into the volume knob
It's wired to the ground and where the signal wire used to go when unplugged the AM signal takes back over.
Because I didn't want to put a modern gauge in when everything else looks retro I found this original in box oil pressure gauge from 1966, I used a metal A/N line to be safe, and it works and looks great at the same time.