I had not realised is was that complicated in the W463/W461
Another reason to stick with a W460!
All lockers are effectively mechanical devices - its how they are actuated that varies.
I am pretty sure 404 Unimogs are cable actuated.
Forgot about including Steyr Puch Pinzgauers - they use a hydraulic system for both front and rear lockers and also for the 4x4 engagement. The older Haflingers are purely mechanical linkages. Both can take a bit of time to actually engage. On the Pinzgauer the light on the dash doesn't come on until the locker is actually "locked in" sort of like landing gear on airplanes...