I believe the factory sender is 1/8"BP and the Defi is most likely a 1/8"NPT. You can probably get away with everything 1/8"NPT and just adding a couple extra telfon tape wrap passes on the BP threads to make it seal.
If you look at my build thread, linked in signature, you can see that I have mine done very similarly to your existing condition. The only major different is I also have my turbo oil supply take off teed in too.
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