Big Green Egg EGG Genius Y-CableY Cables are a great way to expand the capacity of your Egg Genius. You can use two Y cables to add two additional meat probes for a total capacity of 3 meat probes. Plug 1st meat probe into the red lead labeled M2 M3 To expand to 2 meat probes, 1 Y cable is required. Plug the Y cable into the pit jack on the EGG Genius controller. Plug the pit probe into the black lead labeled PIT M1. To expand to 3 meat probes, 2 Y cables are required. Plug 1 Y