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I just bought the red 1986 BMW 635CS(i)- the i in the badge is missing. I got all the filters and oil to do a service, and i am scheduling a valve appointment. However, i have a problem with the instrumentation. Sometimes, the lights for the gear selector (its an auto trans- switchable) don't work. The tach either takes a while to come on but lately hasn't come on at all, and the temp gauge jumps around, then goes dead. I believe that there must be some sort of short in the instrument panel and i am wondering whether finding the wires would be a large project that i should just have done by BMW.