So yea,
- 2 = signal
- 1 = ground
- 3 = power
power on 1 would be CCW (counter-clockwise) increasing
power on 3 instead would be CW (clockwise) increasing
In the schematic, the signal contact slides from left to right when the pot shaft is rotated clockwise.
So if 1 is ground, the signal when close to ground will read 0 and will increase as it moves right (CW shaft rotation).
If 3 is the ground, the signal when close to power will read nominally 5v (~4.8) and decrease as it moves right (CW shaft rotation) and gets closer to the ground.