OK...tach problem solved. Heard back from Autometer today and they say that the tach flashes whenever it doesn't detect a tach signal (see note below). Now I just need someone to confirm the wiring from the coil to the distributor.

The tachometer will flash when it does not see a tach signal. This is normal if you just turn the key to the on position. After you start the vehicle, if it is still flashing, we can look into why there isn’t a signal. Unfortunately there isn’t a way to program the tach to not do this.

Let me know if I can assist you any further.

Kevin
Tech/Service