First thing that came to mind for me was the sender was on the way out. Don't recall what kit you are running but I believe most of them get turbo oil feed from where the factory sender is located. Could be it got slightly damaged during install. Check the harness too and make sure it isn't damaged. Might have to resplice a wire if one got nicked.
Partsgeek.com if you just need the OEM sender.
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