Where is Aux1 in Pixhawk?

I have a 3 axles gimbal needed to connect to a hexcopter. Saw on youtube the person connects it to the same pwm i/o for esc and motor.

But I only have 2 pin left for. pwm i/o. Where can I connect the Aux1?

Ok I found my answer.
They are fmu pwm 1-8
On ardupilot servo9-16