If in range then work.

I just learned about possessing pawns and so i hooked it up to a player and a car so i was wondering if someone could help me with something. I have a target sphere attached to the car and i want it to tell if i am in range of that sphere and talk to the blueprint allowing me to switch, but if i am not in range then i cant switch between the 2. btw i am using the sedan from the starter content.