For each additional machine you need an “Extra Machine Kit”. Depending on what model of iDig Touch you have this kit number could be either an XD527 (Small Combo) or an XD528 (Large Combo).
If you also have Tilt Sensors that you’d like to swap along with your main iDig System, you’ll also need an extra Tilt Sensor Mount (XD429).
If you have the Dozer Blade upgrade option, you’ll need an extra mount for the blade sensor. This is an XD422.
If you have multiple machines that have a second boom, an additional XD422 Sensor Mount will also be required.