They all read the pulse off the coil. The HEI has a terminal that is labeled TACH. Just hook up the lead that would normally go to the (-) side of the coil and you are set. I think he may have been trying to get you buy something he has to sell. Whether it's a pionts or HEI, the tach is on the (-) side of the coil. It's the same reading, just a different location.
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