http://m.summitracing.com/parts/msd-8920
I had to use a tach adapter to get my hood tach to work with a Petronix kit. Works for MSD and Crane kits as well.
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1967 Firebird ragtop, 464, Weiand 8-71, ported 6H heads, Hyd roller, 4L80E, paddle shifter, Moser 9", Cal-Tracs, Vintage Air, Corbeau seats, 13"/12" disk brakes, Hydraboost, electric cutouts and M&H drag radials. 
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