Hi @daveycleaning -
Assuming you’re using the latest version of ArduSub, you don’t actually want to set the servoFunction to gripper, but Actuator1. You then map Actuator 1 functions to the desired buttons in Cockpit.
See this thread for more info.
A big update to the BlueROV2 guides to transition away from QGC to Cockpit and BlueOS is coming!