On the Porsche 718 you need to tap into the DRIVE CAN BUS directly. I was able to do this and "inject it" on the CAN pins of an OBD2 port extender with an OBDLink LX. After reverse engineering all of the Porsche PID's, I have all the track day data you could ever want getting captured with RaceChrono Pro.
Setup:
https://planetkris.com/unlocking-the-porsche-718-can-bus/Implementation:
https://planetkris.com/porsche-718-cayman-can-bus-track-day-data/
Comments
As an update - I got RubberTrac working and did a full up test last weekend at an autocross:
Dash was made with RaceRender.