I have a 79 528i 4 spd that sat for about a year. Engine sounds great except for clack-clack-clack. New to BMWs so i was told it is lifters/valves that simply need to be adjusted. Advice? Shadetree mechanic work? Also, whoosh as i push brake pedal. Power booster shot or just bad master cylinder- been told both. Ok, what is that big yellow pushbutton on the dash? The owner told me it was the rocket accelarator . No, just womdering what it is. Once it lit up but usually nothing. And speaking of lights on the dash. I have none! Except for a faint glow from the batt light. I have absolutely no speedo, etc illumination. Advice? Thanks fellow beemers!