Ford 351w temp gauge housing thread size

I have a Topend IDA quad set up on my engine. They assured me the thread size for the temp gauge sender was 3/8 NPT.

This size was to small so I got a 1/2 NPT adapter, this appears to be the right size but only does up a few threads. However, that seems to be the case on this video https://www.youtube.com/watch?v=e3FvTLG4uqY

Can anyone confirm if 1/2 NPT is the correct thread size, picture of hosing below.
 

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