Perfect TPMS replacement for 2019 GMC 2500HD. The TPMS HCL system was used for new discs. One of the sensors even survived a little abuse during installation. Once installed, set the dashboard to TPMS, press and hold the button and the truck will go into "learning mode". Start at the front on the driver's side and move clockwise around the truck from the left. Front. I used the VXDAS EL50448 TPMS tool. The "learning" process took about as long as it takes to walk around the truck and "run" each valve stem with the VXDAS EL50448.