Oil Pressure Sender and Switch
This is a relatively new one. If yours is older and not as shiny, no big deal. If yours is oily on top, you might want to replace it. It's not easy for oil from any other source to get up on top of that sender, so it's probably the sender itself leaking -- not uncommon. The leak is down inside, where there's a diaphram that separates the oil side from the electrical side. To leak out the top, it has to fill this entire sender and come out around that electrical connector, which of course was never intended to be oil-tight. If your sender has silicone sealant all over the top, you need to do two things: 1) get a new sender; 2) get a new mechanic, the one that's been working on your car is incompetent.
If you need a new oil pressure sender, shop around. The prices vary considerably. But it is not a generic part, you will need the one designed for the Jag V12. Expect to pay about $50.
Directly to the left of the oil pressure sender you can see one shiny flat of the banjo fitting on the back side of the pedestal. Believe it or not, the pedestal is just that: a pedestal. There is no connection to the oil system of the engine at the back of the vee! The oil pressure comes from a fitting in the main galley on the bottom left side of the crankcase near the oil filter assembly, and comes through a tiny tube to this banjo fitting. Two other tubes connect at the same banjo fitting, one to the rear end of each tappet block, providing the lubricating oil for the camshafts and followers. You can see these latter two tubes.
Just below and to the left of the oil pressure sender in this picture, not too clearly visible, is the oil pressure switch, which is what lights the idiot light on the dash when there's zero pressure. This item is also notorious for springing internal leaks and dribbling oil out the electrical connector. It's dirt cheap to replace, though; lots and lots of cars use senders just like it. The oil pressure switch is screwed into the banjo fitting itself rather than into the pedestal.
On this '83, there is another fitting on the opposite side that is plugged. Presumably you could install two oil pressure switches if you wish.
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