Fitech white wire into key power during key on/crank

hey everyone, i just installed a fitech fuel injection on my 70 dart...i'm new to all this so bare with me...i need to connect the fitech white wire to a wire in the dart that has constant power when the key is on and during crank...what wire would i tap into? would connecting it to the positive terminal on my ignition coil do the job? any help would greatly appreciate it!