Its basically a valve that "locks" the brake fluid pressure to hold your brakes.
Apply pressure to your brakes, hit the lever or switch and it holds that pressure till you move the lever or switch to release pressure.
If your factory e-brake works in your wagon, I wouldnt bother with a line lock.
you said 62 so I figured it was a wagon....not a 62fj/bj/kj/dj/lj/pj/ppj/or bbqj