PS3 Controller?

Has anyone been able to get the right/left trigger axis to work with a PS3 controller.
I’m using a mac on version 4.13 of the editor and have my PS3 controller connected via bluetooth.
I am able to use the right stick axis to aim.
I can set the throttle to use right/left trigger but that only gives me 0 or 1.
When I set to right/left trigger axis my result is always 0.