I'm assuming a HEI distrubutor with the coil mounted to the top of the
distributor cap right? If that's the case, on the driver's side of the
distributor there is a square section that will have a red wire leading into
it (this red wire is the +12V feed for the ignition system). If you look
where it plugs in, there will be an empty slot labeled "tach." Run a wire
from this slot to your tack and voila.
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