Goto IH website, input the last 6 of the VIN. Then download software. That simple, but if your not capable of doing that then the dealership will give you a disk with the software on it.
Here's something else for you, you MUST use the IH software to clear the light. Or maybe you could find a buddy at the dealership and by him a case of beer
If you can't get that light off and the driver knows what he's doing then expect that truck to come back for 'safety' reasons! Have fun!