[zork]

The fuels in vehicles use "AMMOSLOT" and "FUEL" in the default color table. Others are not specified.

http://wowprogramming.com/utils/xmlb.../UnitFrame.lua

If your want to make the shield appear. Using sth. like this will work in oUF 1.3.28

local function checkShield(self, event, unit, interrupt)
  if interrupt then
    --show shield
  else
    --no shield
  end
end

local function checkCast(event, unit, name, rank, text, castid, interrupt)
  checkShield(self, event, unit, interrupt)
end

local function checkChannel(event, unit, name, rank, text, interrupt)
  checkShield(self, event, unit, interrupt)
end

self.PostCastStart = checkCast
self.PostChannelStart = checkChannel