So I have a Monoprice mini v1 that I have replaced the board with ramps 1.6 an arduino processor, and lcd display. I have loaded marlin 1.1.9. The newest modification has been to try to implement auto bed leveling by adding an inductive sensor and connecting it to the z endstop ( exchanging it for the switch). To this point it looks like G29 S1 is working as expected but when it tests for the 3rd point the y axis move carries the sensor outside of the build plate. What settings do I change in the firmware to fix this? Thanks in advaance.