I do not know of it will work, but i found this message on the internet!
Units has to be millimeters, I could not get the probe to work with Inches.The probe should be connected to the A5 input on the arduino.i connect the two touch plare wires to GND abd SEL pins on the GRBL board, but it is like Estlcam does not "see" this input
I also found this text on the net
Hope it helpsI'm using proximity sensors for my limit switches. If you are having trouble with your Z axis limit switches not working, try swapping the connector over to the Spindle Enable pins... There are two versions of GRBL, one that uses the old z limit and one that swaps it over. I also hooked up a touch probe and created a macro so it measures the z height of your work accurately by finding the height at medium speed, then again at low speed.