You can find the Wotlk version here: https://wago.io/7AB2s_lkN
This is based on the Classic Vanilla WeakAura by Zippy: https://wago.io/_ah46FI84
A video explaining the WeakAura: https://youtu.be/2SynZ2KFjLY
This WA makes it possible to automatically switch between Equipment Sets by hovering over, targeting and/or killing NPCs in any TBC raid (…Hitcap/Trash/vs Undead or Demon/Resistance/Riding Gear - you name it) by utilizing the AddOn ItemRack/Gearquipper (see Curseforge/Twitch).
Specifically, it can equip pre-defined sets of gear…
1. as you enter raid instances or specific subzones within these raids
2. as you mouseover or target and kill bosses
3. as you mouseover or target and kill Level 73 trash mobs (currently none are known though)
…in all TBC raids
Currently only fully supports English. Other languages will be worked on, the only thing that doesn't work for non-English clients are gear changes upon entering a subzone (e.g. equipping gear set for Illidan when entering the Temple Summit subzone).
Switching is very useful, as "optimal gear" usually differs greatly between individual Bosses and Trash. Especially for Trash you can switch out +Hit for far more valuable bonuses or where specific trinkets are better suited for individual boss trash. Healers may also benefit from exchanging +Heal/MP5 sets. Perfect equipment switches create an advantage in speed runs and parse-oriented gameplay.