How do I give GUI to specific rank within my group?

How do I add in a group rank at if newPlayer:IsInGroup(000000)? I want to make it so that only specific people receive this GUI piece that is a certain rank.

game.Players.PlayerAdded:connect(onPlayerRespawned)
function onPlayerRespawned(newPlayer)
	wait(1)
	if newPlayer:IsInGroup(0000000) then 
		gui=Instance.new("BillboardGui")
		gui.Parent=newPlayer.Character.Head
		gui.Adornee=newPlayer.Character.Head
		gui.Size=UDim2.new(3,0,2,0)
		gui.StudsOffset=Vector3.new(0,0.5,0)
		text=Instance.new("ImageLabel")
		text.Image = "https://www.roblox.com/asset/?id=000000"
		text.Size=UDim2.new(0.15,0,0.45,0)
		text.Position=UDim2.new(-0.15,0,-0.45,0)
		text.BackgroundTransparency = 1
		text.Parent=gui
		w = game.Lighting.WepsGroup:GetChildren() 
		for i = 1,#w do
			w[i]:Clone().Parent = newPlayer.Backpack
		end
	end
end

function onPlayerEntered(newPlayer)
	newPlayer.Changed:connect(function (property)
		if (property == "Character") then
			onPlayerRespawned(newPlayer)
		end
	end)
end

game.Players.PlayerAdded:connect(onPlayerEntered)