There are other options for a selectable locker such as the cable actuated Ox locker, or the ECTED locker, which is an electronic one....just some other ideas in case you do not want to hook up an air compressor and/or an air tank.

Gun it and run it!
1981 CJ5,258,T-176,D300,AMC 20,Dana 30,Trxus M/T 31x10.50, Rancho 5000's, GroundPounderFab front bumper, polyethylene gas tank, aluminum dash, AutoMeter gauges

What this country needs is unemployed politicians.