Convert 6 cyl tacho for use with 4 cyl

[Peter Gargano]

What's the best way to convert an analogue electronic tacho,
set up for a 6 cylinder, so it reads correctly for a 4 cylinder.
Assuming there is no access to the internal electronics, just the
external signal from the coil. (logically, the tacho requires 3
pulses for every two pulses the coil generates).

Peter
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