All S13/S14 manual speed sensors are the same diameter and fit in the same transmission hole. S14 and kouki 180SX have a different connector style but the fitment into the transmission is the same.
Specifically S13 240SX SOHC and DOHC manuals '89-'93 are the exact same part number.
The one with the pink gear looks like an auto speed sensor to me, return it.
I think the black rollpin on your old sensor just isn't inserted all the way.
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