What is acceptable level of vibration?

I ask for help in assessing the acceptable level of vibration, for example, what permissible boundaries on the Vibe tab should be that the aircraft is armed and in flight vibration does not interfere with steering? I am using Holybro Pixhawk 4 with a plane with a Internal combustion engine . I guess what i need when assessing the impact of vibration to select the parameters of INS_GYRO_FILTER, INS_ACCEL_FILTER and choosing a method of Vibration Damping