Ahhhhh,

CSM !!! I bought one gyro from them ( ICG360 ) Heading "lock" was gently unsteady ( ! )... carefully trimmed parameters for a plane.

and then ... servo got dead-locked to neutral - and no way to reset the gyro parameters !!!

No help from CSG nor ( except buy the new 540 model at a fair price ...)

The sensor ( and its NTC ) is now in my Sensors box !!!

Alain