Pin 2 and 1.
if using an AiO v4 these could be read directly with steer, work or remote inputs. (but there’s no code for Teensy OG)
On v2 or kapoi pbc I’m not sure the signal would go high enough to change the state, it’s probably OK.
You can’t put these signal directly to the microcontroler
So far I never attempted to read frequencies but I will try in the next weeks for an other project.