Laine,
Do not forget the IP advance solenoid. When your truck is cold, that advances the timing on the IP pump. This is what makes our trucks really clatter for a little bit when cold.
The same circuit powers the high throttle solenoid holding the throttle a little more open and causing an increase in rpm. (Maybe not in 10* weather after sitting all night but it would at least cause it to idle at the normal speed.)
As mentioned the coolant temp sensor (Think on/off switch.) allows +12v power say to pass through between terminals and go to the solenoids when the engine is say less than 120 degrees to the advance and idle solenoids. As the engine warms up the sensor cuts off the power.
Now don’t go getting all crazy and put in a timed switch for those solenoids. Just use the sensor. If you do all the members will have to follow you and then the bickering will start about how long my timer is vs long your timer is.(Pun intended)
Looking good!