1985 D150 "Mr. Curtis" race truck with a 2015 6.4

So that's down. If you had the option of installing a light/rain sensor, to have automatic wipers and headlights, would you do that?

It's not overly complicated, provided i find a flat spot on the windshield to mount the sensor to. Route three wires to that spot, connect and be done.
I would. It sounds like you have everything needed to do it so why not.