DON"T Do it. You already have the best Brand in alignment equipment. My machine is also a P611. I just ordered the update. It will still be current for 2014 when done. Just remember u get what you pay for. The parts to fix it might be scarce but search it out or have and computer guru fix it. Just my thoughts. Tim

Tim Jaeger
Technician/Owner
Its All Good Auto Repair LLC
Franklin, Wisconsin, USA