I've been trying to get HPT to run the Outputs in standalone mode as a daily driver type DIC thing since the outputs only work when a Laptop is connected and scanning... however they wont do it... so I made my own..
Fully configurable... 100% accurate.. I have it reading most any GM specific PID you can think of... Knock is really the only important one.
Works on any GM 2001 or newer... maybe even older... but the knock doesn't work with say my 1997 Chevy Truck Vortec 350.. not yet anyway... need to find the knock PID for that one.. Also reads all of the standard SAE PID's as those are readily available...
https://www.youtube.com/watch?v=uiVMhhTgudo