If you look on the side of the block (drivers side) there's a pipe plug that goes into the water jacket, I used that for my electric fan sensor. The plug is just to the rear of the frost plug.
Thanks for responding. Based on yours and Vitamindart's guidance I found the hole with the pipe plug in it. In addition, it appears the orginal sensor can be relocated without having to extend the wiring attached to it. Again, thanks for the assist,