You've probably noticed that the front parking lights on your '67 go off when you turn on your headlights. This is completely normal. In fact, all '67-older GM and Ford vehicles are set up this way intentionally. However, it's a very simple mod to keep the parking lights on while the headlights are switched on. All it takes it moving the purple wire in the headlight switch connector to the vacant terminal on the switch. A small flathead screwdriver is all you need to release the wire from the connector. Just plug it in to the empty slot on the connector which lines up with the empty terminal on the headlight switch. Voila'...your parking lights will still work when the headlight switch is pulled out one click & they will stay on when you pull the switch out fully for the headlights.