Tach hookup

["Doug & Rett Leithauser" <dleit@mintcity.com>]

My tach (original, working, not fried) is  connected to the distributor side
of the coil. I've worked with a lot of different tachs & have never heard of
connecting to the ballast resistor or the power side of the coil, I don't
see how such a hookup could work.
Doug Leithauser