There will be a center channel that runs up the center, hence the OE plug that gets moved to the end.
The port for the sender is drilled deep enough to go past the center channel.
If you look at the pic you posted, there is a dark spot at the bottom right. ....that's the center channel.
The sender fitting definitely does not screw in to the bottom, else it would block the center channel & the sender wouldn't work.
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