Mechanically caging is permanent, electrical caging forces the gyro to stabilise. I guess you could manually cage then uncage it, but when pulling say 6G onto the target it would be much better to do so electrically via a button on the throttle grip.
First you mechanically uncage it then prior to an attack the sight should be electrically caged to stabilise the sight, limiting gyro deflection as the result of any manoeuvring on initial approach to the target.