Liquid Tank % Measure

local tank = peripheral.wrap("drum_0")
local info = tank.getTankInfo("unknown")

-- prints information >>
print(textutils.serialize(info))
print(info[1]["contents"]["amount"])

while true do
  info = tank.getTankInfo("unknown")
    if (info[1]["contents"]["amount"]) / (info[1]["capacity"]) < (0.8) then
      rs.setOutput("top", true)
    else
      rs.setOutput("top", false)
    end
  sleep(5)
end