I have replaced my oil pressure sender. It's not an expensive part and you can do it with the engine in the car. I have no A/C on my car, so I don't know if that's an issue. It takes a big crows foot wrench (I forget the size but I found one at Sears, maybe 19mm) and a pretty decent length extension. You have to be real careful not to rotate the piece that the sender screws into as it is itself screwed on to stuff, like a T and those joints can then leak.
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