Here are links to what I used so far
Used a few of these as extensions on the pressure sensor.
1/8 Male-Female BSP adapter
The tee fitting I used. If you look closely, it's BSPP to BSPT. This is part of the reason that I used the thread sealant. No leaks.
1/8 BSP tee adapter
Adapter to install 1/8 BSP fitting into the oil pan
Greddy 1/8 BSP oil pan drain plug