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That green o-ring makes me think A/C system to me, too. I can't see inside the ends if it. Does it look like a Schrader valve? (Think tire stem). All I can think is maybe a pressure test port. But there should be external threads to connect the gauge.
Either A/C or maybe the broken half of the oil pressure sensor ? I know that over time they become brittle and fall apart... Does the truck read oil psi?
Then I would think it’s the A/C then... check all ports and valves and what not ???
I've had that done to me. Years ago, when I was a maintenance tech in a Michelin manufacturing plant, we had to take exams for advancement in pay levels. Part of the exam process involved assembling a machine. There were always extra parts in the box. Not just extra nuts and bolts of various sizes. But extra gears or pulleys or things like that, some of which were very similar to the parts you really needed. These exams were not simple. The last one I took was at least 2 days long if I recall. The blue prints were in French.
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