The trigger output of your breakerless conversion doesn't go directly to the coil -- it goes to the white tach wire. The other tach wire into the engine bay (I should this as being orange) hooks to the coil negative. That puts the tach in series with the coil trigger signal.
The red wires to the tach are lighting (as I'm sure you've seen), and there's a green wire to the voltage stabilizer (regulated 10V supply). I remember there being a black ground that goes between one of the two mounting clamps and the knurled knob that fastens it.
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