68 how do you keep the parking lights on with the headlights

My sales brochure called the front parking lights on the 'Cuda rallye lights.

The text says:

Sure the 'Cuda's got rallye lights. Big, square yellow ones. And when
you snap on your headlights, they continue to burn. Why? So you can spot another Barracuda coming towards you at night. So you can wave or tap
your horn.
You've been elected to a club. With a quick-cornering membership badge.