Although somewhat outside the scope of this INDI forum, one traditional way to get a Celestron mount PEC curve is to use CPWI (free), and PECTool (also free). You drive the telescope during the test with your guider and CPWI, and then record N PEC curve sessions (batch process, averaged) with PECTool. After it's done, upload the curve to the mount using PECTool. Once uploaded, it is semi-permanent (until a new curve is done or disabled). FYI, PEC must be enabled on each mount power-up (hand controller or INDI mount - control tab). On startup, the index position of the worm gear will be found, and then you can start the PEC playback.