blinker indicator in dash

Back in the 80s, GM set their side marker up to burn with park and also blink with turn. All they did was route the current to ground path through the 194 bulb in the side marker fixture. Thus a turn indicator in the dash coming on with park lamps meant side marker bulb that side had failed.
As for Chryslers bean counters... First year of Dodge fender mounted turn signals, the indicators were still in the panel but those bulbs and sockets were omitted. Customers complaints and service techs having to install these quickly put a stop to that practice.