Tachometer Adapter

An adapter is necessary when attaching a conventional tachometer into the Hall Effect electronic ignition system. See Fig 2. Tachometer black lead is attached to engine ground. Attach adapter to tachometer red lead.
Adapter is formed from 2 wires soldered together at one end. One wire (leading to coil terminal 1) must be equipped with a 1000 ohm, 1 watt resistor. The second wire (also leading to engine ground) must be equipped with a 12, 000 ohm, 1 watt resistor. Both resistors should be soldered to attaching wires.

Fig 1: Schematic Diagram of Bosch Hall Effect Electronic Ignition System
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Fig 2: Assembling Tachometer Adapter
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