The Taz 1 isn’t the best candidate for automatic bed leveling. If you want to go that route, I would recommend rebuilding your printer to either Taz 3 or Taz 5 specifications before proceeding. You can get the metal pieces here: http://i-t-w.com/hardware/
The Taz 1 is most likely 12V, so you may also want to upgrade the bed and the power supply using the upgrade process here first: https://ohai.lulzbot.com/project/taz_12v_to_24v/accessories/ before you consider that.
Going with the Taz 4/5 style Z endstop means that you won’t have to re-level the machine hardly ever. The Taz 1 with the smaller endstop target located on the motion segment tends to move. A lot.
If you decide to upgrade your Taz 1 as is anyways, basically you need to find a proximity sensor mount that will work, Follow the instructions here: http://www.thingiverse.com/thing:539692 Make the changes to the firmware as directed, and then add the automatic bed leveling Gcode to your startup gcode section inside whichever slicer you use to make your print paths.
If upgrading your printer to 5 spec seems like it is too complicated, don’t attempt to install auto bed leveling.