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Yes, thanks, I just figured that out. I am old enough that I do remember that, you can hear something similar in the beginning of Wish You Were Here. I have a Blaupunkt Frankfurt for the car so I’ll probably end up using it. I also went down a 1970 tach adapter rabbit hole. I did find that I need a Bosch unit part number 0 227 990 001. Just found and purchased one, obviously used but hopefully in working condition. Those tach adapters seem to be like hen’s teeth and rocking horse poo.
Also, I discovered they are referred to in a number of ways. They are called “Switching SCR” in the 1969 diagram, “Intermediate Unit”, for the 70, and also referred to in the manual as “RPM Sensor”. Nice, no chance of confusion there!
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