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

You can make a jumper at the headlight switch - had to do that on my 68 Charger. Looka at a wiring schematic and find the terminal for the tail lights, and the terminal for the parking lights. The parking light terminal will be switched off when the headlights are turned on, but the tail lights are always on. so you have to make a little jumper wire to connect the tail light terminal to the parking light terminal, and it should work.