How would you make a GUI appear with Touch Interest?

I currently have this script for a click detector, but I need to make the gui show up on touch. I tried to make the code the same but use touch interest instead of MouseClick but It won't work. I also want it to check if the gui == or doesn't = nil like I did with find first child.

function boop(Player)
    if not Player.PlayerGui:FindFirstChild("Gui") then
        local gui = script.Gui:clone()
        gui.Parent = Player.PlayerGui
    end
end
script.Parent.ClickDetector.MouseClick:connect(boop)