Why not just use the built in Calc PIDs editor?

In the Scan Window, click the drop down arrow on the [Options] button and select "Calculated PIDs" (or just use the Ctrl+K hot key).

Calc PIDs in data logs are updated instantly (when you close the calc pids editor, or click [Apply]) , no need to try and understand/edit the calc pid *.ini data files.

Regards
Paul