I remembered to bring the crimpers back to MakerCave and finished the wiring for the K40 Laser Engraver and Cutter water flow sensor. I attached the female connectors to the water sensor and the ferrules to the WP (Water Protect) terminal and the Ground terminal for Laser1.

I entered the Manufacturer Parameters by pressing the Stop Button and then the Shift Button.

Then I entered Laser Parameters…

I changed Laser1 Water Protect setting from Close to Open.

I unplugged the water pump, turned on the K40 and pressed the Laser button. It works!