ABS-off / anytime diff lock

I seem to remember at some point, reading about a way to do these two mods in one go. As in, the switch that turns off the abs, also allows you to lock the diff in 2wd. Am I imagining? A

I've seen a few different ways to do the anytime locker. Any pros or cons to either of the methods? If I remember correctly, one makes your computer think it's in 4lo, and the other uses a relay.