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

Hmmm. Never noticed there was a difference between the Barracuda and all the others.. wonder why they did that. My barracuda keeps the parking lights on with the Headlights...

I did notice my daughter's 66 Mustang turns off the parking lights. Actually the switch design is very similar to the Barracuda. I was thinking about doing this modification to her Mustang!