Tac won't work after Ignition upgrade.

[Canadian1968]

I had a posted earlier that I installed a new MP Ignition kit (Orange Ecu)  in my 68 Charger.  Everything in , realized had no Tac, and foud that we had cut the wire and forgot to reconnect it after the install. Ran new wire from fire wall to Negative on coil, and we stil have no reading on the tac. Is there something I missing here?? That is the only wire that we would have disturbed when installing the new ignition correct??

[John_Kunkel]

Factory tach or aftermarket?

[Canadian1968]

Factory TIc-Toc -Tac

[John_Kunkel]

Some folks report that the factory tach doesn't work with the electronic ignition but the newer reproductions do.