The temperature sensing bulb goes in the port in the head (second picture).
In your first picture, that's a port for a vacuum line (to the wipers and in the case of a vacuum operated 2-speed axle, for that.) It looks to me like that tapping has been enlarged for the vacuum requirements for a 2-speed axle. What did the engine come out of?
The last two pics look like the line between the oil gallery and the oil pressure gauge. It doesn't matter which end is which as long as the captive ferrule on the nut seals against the tube. It looks like in your pic #3 that the nut has been slid up the tube a bit. It would have been where the ring around the tube closer to the end. I would cut that compressed section of the tube off.
Last edited by Phak1; 10/20/2025 12:04 PM. Reason: Removed wording to reflect title change
