This pack uses modified versions of https://wago.io/ExternalAlert , https://wago.io/QXHvE1FVY & mainly -> https://wago.io/LJyGaF5rr
This weakaura allows you to send and receive alerts for Tank Externals (The receiver can also be used as non tanks). You can see/edit which abilities are active in the Actions > On Init box of the External Sender weakaura and modify their priority.
The tank needs to make a macro (found in the Custom Options tab of the External Sender weakaura) OR mouseover&click the icon to send alerts to the healer (via whisper or receiver weakaura)
You can also use this weakaura as a dps to call externals, go to the External Sender weakaura -> Load -> uncheck spec role
Credits to: Reloe, EmElw & Jdotb