The sensor is putting out a 12V signal, but the tach is expecting 100V+ signal from the coils of the gasoline ignition system. Folks on 914 forums suggested either designing a booster circuit with parts from Radio Shack, or just buying a tach adapter unit by MSD.
This is how it looks out of the package. The wiring is very simple, with 12V power, ground, tach sensor in and tach output out.
I wired it up and it worked first time.
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