1st... the electric choke control is an asistant to heat sooner the bimetallic coil and get iddle faster when warming from cold

2nd... being an assistant IS NOT MANDATORY to hook it up, just will take longer to get iddle, because bimetallic coil will still be heated up by the manifold heat source

3rd... the electric choke control were released on those years in two presentations. Single stage to /6 and 318 cars. IS the unit on first pic. Provides one voltage lever to heat the coil until engine bay gets hot. Then double stage, what is basically same unit, but with an external ballast resistor attached ( same resistor like the round unit shown ), to change the voltage level and heats the coil in two diff stages as far engine bay gets hot, sensed by the ballast.

On these years the source to the electric choke control was spliced from the blue wire running to alt field what provides power in RUN

on later years this control took the power from same RUN source but JUST when the engine is running, The only way to get this was an oil sender with a positive switch to send the power JUST when oil gets the sender, what it means engine is running. That keeps safe the choke is being feeded with key accidentally in RUN but engine not running. This oil sender has 3 prongs. Oil function what is ground as any earlier sender, and the positive input FROM RUN and positive output to choke