Q: My oil pressure rises and lowers.

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So over 2 months ago my check engine light came on. I had it checked and it was a thermometer in the engine. I have yet to get that fixed. Also over the past 2 weeks while i drive, my oil pressure begins to rise, then once it shifts, the oil pressure drops and goes back to normal. I’ve noticed if i don’t apply as much gas it won’t do that. Also my service 4wd gage turns on as well. Not sure if all of these are tied together at all. My temperature gage doesn’t move at all which is a good sign, and it doesn’t seem like I’m burning oil (atleast to my knowledge). There is a clicking noise that comes and goes in my engine bay as well.

My car has 198000 miles.
My car has an automatic transmission.

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