how do you know witch number to download

[samzram]

i dont know which calib number i have how do i find out i have tha 7130 programmer.and do i have to return to stock settings b4 downloading new programs

[AUcummins]

You need to return the truck back to stock settings before updating your Predator. To determine your Cal ID# just plug the Predator up in your truck and go to the Diagnostics menu I believe. It will give you an option to find your Cal ID#. Just scroll through the menus; you will see it in there.