buying and installing a period correct radio is not difficult
Well yea on a 911. A "water temperature gauge" on an air-cooled car wouldn't tell you much! OK, but what do you do with that information? Pull off to the side of the road until the oil warms up? I'm just not getting what action you would take based having both coolant and oil temp...
www.e9coupe.com
old radios had a five din connector that works well for the aux input signal of any modern device, to couple it with your bluetooth device is another thing, but not really needed
i found that the radio receiver is much better than my modern car radio
make sure that you fit a good antenna and a good installation of speakers
nothing too sophisticated, but a four system, including two in the rear shelf, one in the dash speaker place and one to compensate this fornt one opunder the passenger seat in a cigar wood box
if your radio has the uberendegler function that is ok if not add a separate unit to fade front/back, the second speaker under the front seat is crucial to compensate the impedance