Whatever signal from the Crane that triggers the MSD, or tach, should trigger the Speed Switch/RPM Transducer just fine. Just to be sure ... test the input signal at the RPM Transducer with a 12 Volt test lamp, and it should blink during cranking.
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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