External imu on pixhawk cube


I would like to try to use an external imu (mpu6000 for example) and to not use anymore the three internal imu’s for an experimental platform.
The external imu could be plugged in the « i2c2 » ouput of pixhawk cube.
Does anybody know where I can change the source code of firmware to tell the pixhawk to ignore the native imus and use the external one only? Where is located the source file that defines the pinout and sensors of fmuv3 in the source code branch??
Thank you very much for your help

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Hello @francois1452,
you managed to connect an external IMU?

I have some problem.