Some examples of each type of Gyro :

Rate Only:
Heading Hold/Rate (switchable via seperate servo input signal)

Heasing Hold/Rate (switchable only via on board switch and not via servo input)
  Futaba GY240

Reversing switch:
If they have a reversing switch then you can mount them within the right axis of rotation and then flip a switch if you need to reverse them. Those that don't have a reversing switch, have to be rotated 180 degrees if reversing is needed.
Getting a gyro with a reversing switch is not that necessary because once you determine the orientation to mount it, you almost never need to change it.

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