just to confirm with Jason s (SuperNovaSS) reply,..i talked to a guy at Williamsons Instruments and he says that an HEI ignition ,4 pin module, produces a square wave signal as does the GM standard point ignition, so it will work....i mocked an HEI up on my distributor machine and powered the HEI with 12 volts ,hooked the tach up and RPM readings were the same on the SST-802 and the machine......i hope i phrased that correctly..
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