Actually its quiet easy .. I have 2 of them and I may have one brand new for you if your still looking and I know I have 2 with tach drives ..they are FORD MOTORSPORT versions of the DURASPARK.
The hard part is finding a box with a red strain relief .. RED Calif cars 1977, 302 V8 only 1978 - 1979. It produces max spark intensity.
Ron
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