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Old 04-16-2007, 02:02 PM
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DeliveryValve DeliveryValve is offline
Chairman of my Benz
 
Join Date: Jun 2006
Location: Central California
Posts: 4,159
Here is a wiring diagram to the control unit. #80 is the control unit, #82 is the RPM pickup, and letter "A" is the lead that goes from the control unit to the Tachometer.

Hope this helps somewhat.
Attached Thumbnails
1985 300D CA Emissions Tachometer repair-85-wiringcontrolunit.jpg  
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