[skyking]

Thank you for the link Daox. No need for me to reinvent the wheel should I choose to automate this.
khafra, initially I will manually control the basic settings of the grille. I am converting to a pair of electric fans and a controller on or about the same time. I can hook an indicator light up to show me "fan on" and then make slight adjustments to turn it back off.
I'll use an offset pivot to use the wind to help me close the louvers. This will put the load on opening them.
When I get the servo and louvers working properly I can move towards automation. I won't bother with inlet air temps other than to note and track them. Coolant and underhood temps will be the things I'll look at, and none of that will come from existing sensors. This truck is pre-OBDII and anything I do is custom from the start.