Oil press sensor thread..?

Hi Cudamark,
If I understand well, the light sender threads are NOT 1/8npt and an adaptor is needed?

I found this old post on FABO :
My memory from when I last added a mechanical guage to a slant(1999?) was that the oil pump outlet threads are 3/8" npt and most common pressure senders use 1/8" npt.

So.... 1/8NPT or 3/8NPT oil pump outlet threads on the slant?