You can order the Miller tools thru your Cummins dealer. Cummins uses the Miller Tools. The Snap-on set is better if you can find a Snap-On indepenedent dealer. Go to the internet and go to
www.SnapOn.com and then go to a "dealer search" for your zipcode. I don't know of anyone who rents these tools out. Our mechanics prefer the Snap-On tools in our shop not the Miller ones. You can order the Snap-On tools online.
The Snap-On number is: #SP500, cost is $221. 70 US
The Cummins (Miller) number is: #3824563, cost is approx $245. 00 US
The tool set consists of a 2 stage dial indicator; a delivery valve barrel adapter; a delivery valve socket; a gear puller; a box to hold it all. You will also need an engine barring tool to turn it over or use the nut on the alternator. The barring tool is better.
You will also need a nylon hook shapped pick (Ace hardware; Bass Pro shop or Academy Sports) to extract the dv washer once you remove the delivery valve. a nylon pick is better than metal so you don't scratch the delivery valve barrel's interior walls removing the washer.
You will need a new washer for the delivery valve seat. (Dealer)
You will also need a good magnet to keep from dropping the gear nut and washer into the front cover (Lowes or Home Depot in the cabinet hardware section) (this would be bad and involve significant time and engine disassembly to get it back out).
It has a relatively fragile dual dial indicator tool in the kit which could be easily broken from misuse.
Thats probably why no-one wants to rent them out.
If this is your first time doing this make sure you have a whole Saturday and Sunday out of the weather. Take your time, go slow, check everything you do. Keep everything around the injector pump VERY clean. Make sure you don't bend the injector line coming out of the top of the #1 delivery valve.
Good Luck..... Its not difficult