Percolation? Heat soak? Don't drive during summer??

Boo, its a brand new coil with barely any miles or drives on it lol.

How do you know your rpms if you have no tach?

If you're driving an auto in D, does it matter? LOL

Until you can figure out whether the wire is damaged or shorted, I'd just as soon leave it disconnected to rule it out. The tach should never alter the behavior of the of the ignition - I have a tach, and my ignition does not fire at rest with the key on.

Hopefully your coil is OK, but I doubt it. Excessive current has a way of roasting electronics. It may work for now, but I definitely wouldn't drive cross town without a spare on hand!