Assuming the Predator 79cc is similar to the Greyhound 79cc (both HF engines, Greyhound is older)- I followed AGK's 99cc stepthru and it was perfect.
AGK's 99cc build tutorial is here:
https://www.affordablegokarts.com/99cc-predator.php
It has a lot more detailed pics than the 79cc version linked above, and they're very similar.
The low oil sensor is BEHIND the cam (tan part in this pic):
I also totally removed the governor and tapped threads in the engine casing hole. It was easier than I thought it would be. Governor used to be in the hole in the upper left of this pic, low oil sensor lower right:
Finally, the offending parts (top to bottom: paddle, governor, low oil sensor):