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

Be aware that motorcycle turn signals are not legally or technically adequate for cars and trucks. Today's motorcycle turn signal intensity and size requirements are less than half what they were for cars and trucks in '68—and the inadequacy is even greater if we compare today's motorcycle signals to today's car/truck signals. Be an awful shame to get in a crash because your homemade signal system didn't do an adequate job of conveying your intent to other drivers (which is, after all, what they're for...they're not fashion accessories or toys). Be an even bigger shame if the crash were deemed entirely your fault ($$$ tickets, insurance hikes and/or lawsuit) because of your inadequate safety lighting. Don't laugh it off; it has happened.