The RIMU (sometimes referred to as a gyro) is not waterproof, and is only designed to be installed in the cab.
The RIMU can be mounted flat or it edge parallel with the tractor typically in the front right corner of the cab.
The RIMU needs to mounted securely with screws into metal. It is up to the user to check and make sure the screw will not damage any of the tractors components.
Install in cab of tractor