Hayden Fan Controller Wiring Question for 67 Dart 318

The Electric fan works great but is wired to stay on when the car is shut off. I want to change that so the fan shuts off when I turn the ignition off.

I need to wire the fan controller to a 12v wire that's tied to the ignition and want to know the best/easiest way to accomplish this. I prefer not to run wire under the dash unless I have to.

Can I run the wire to the positive side of the Coil? Something else ?