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Detailed wiring from the Demystification Guide #492-4509 8 pages 548KB p7-97 to p7-104   Mistake in 492-4509 manual - The 113476 and 78-0060 tachometer does not get it's signal on the gray wire from the B+ terminal of the voltage regulator. This is also incorrect on page 3-10 describing the tachometer's operation.
The gray wire comes from one of the regulator's AC terminals.   1991 520-H model 41-20OE02 Serial 1000001-199999