I have a 1990 300E and have an issue with my gear shift position sensor—or whatever it might be called. About 60% of the time, my car won't start when it's in Park, but I can shift it to Neutral and it starts perfectly fine. So I presume there's an obscure switch somewhere that isn't sensing the fact that the gear shift is in Park. I'm not sure where that switch might be, but if anyone could help me solve that issue, I would certainly be very grateful.

Thanks in advance!!