[wayne robson]

Hi Diamond 911, thought i would let you know,when i lived in California fifteen years ago
i owned a 1984 Mercedes 300 Diesel , it had a factory Blaupunkt Becker Grand Prix 612
it was correct for that car as i meet other Merc owners with same radio, and i purchased
my car from original owner,for memory it had the words Electronic along the bottom ,
so i think that perhaps your radio may not be correct for your Porsche.--this may help you. regards.