apologies for this low level tech question, i've been searching for a Porsche CD-1 stereo head unit operators manual, with zilch results, so i hereby modify my request: can anyone send me instructions on how to adjust the clock? the other operations are quite easy to figure out but the clock has got me and it drives me crazy to have the time set on the radio out of sync with the time set on the dashboard clock, thank you in advance. '89 Porsche 951.