Hi, For many years I had a great Pioneer KEH-P5730R radio/cassette player. Now have a new car with rather poor integrated head unit and of course no tape player. So...I plan on connecting the old radio/cassette via a detachable 12V cigarette lighter cable (some on Amazon). The unit has Left and Right "preout" phono type sockets as well as the usual pin connectors. The preout phono sockets are 500 mV/1 kohm. New car has an auxiliary socket which can feed the new head unit. Question is am I OK to connect the phonos to the aux plug (via a female aux socket). Is there a "special" connector I need with regard voltages. Also I assume an earth to the radio is not needed as the negative is probably doing that job. Radio will not be attached to the facia (!) Help welcome!! Thank yo v much!