Nice! What you have there is not only the Safeguard Sentinel Lighting (L41) but also the Automatic Headlight Beam Changer (L68) which was only available if the Sentinel Lighting had been ordered.
The device next to the radiator with the amber lens is the sensor for the Automatic Headlight Beam Changer. If one drove at night with the high beams on, preferrably on a lonely highway, then the headlights of an oncoming car would trigger the sensor and the lights would dim to low-beams automatically until the oncoming car had passed.
The Sentinel Lighting was not uncommon and from what I've heard worked pretty well. I think the Automatic Headlight Beam Changer is a rather rare option on Chryslers. Not sure if it worked well.
The idea itself was not new in 1969. GM pioneered it as their "Autronic Eye" beginning in 1952 on Cadillacs but it was sensitive to changing lighting conditions such as street lights making the headlights flicker between high- and low-beams. I can only assume Mopar devised a more reliable solution later.