How to edit the axis in Position?

Player = game.Players.LocalPlayer
repeat
    wait()
until Player.Character
Character = Player.Character
gui = game.ReplicatedStorage.Text:Clone()

while true do
    magnitude = (workspace.CopHat.Position - Character.Torso.Position).magnitude
    if gui.Parent == nil and magnitude < 20 and Character.Torso.Position.Vector3.x > -17.547 then
        gui.Parent = Player.PlayerGui
        gui.FrameOne:TweenPosition(UDim2.new(0.3, 0, 0.75, -5))
        gui.FrameTwo:TweenPosition(UDim2.new(0.45, 0, 0.75, -5))
        gui.FrameThree:TweenPosition(UDim2.new(0.6, 0, 0.75, -5))
        gui.NameLabel:TweenPosition(UDim2.new(0.1, 0, 0.75, -5))
        gui.Textbox:TweenPosition(UDim2.new(0.1, 0, 0.8, 0))
    elseif magnitude >= 20 then
        gui.FrameOne.Position = UDim2.new(0.3, 0, 1, 0)
        gui.FrameTwo.Position = UDim2.new(0.45, 0, 1, 0)
        gui.FrameThree.Position = UDim2.new(0.6, 0, 1, 0)
        gui.NameLabel.Position = UDim2.new(0.1, 0, 1, 0)
        gui.Textbox.Position = UDim2.new(0.1, 0, 1, 0)
        gui.Parent = nil
    end
    print(magnitude, gui.Parent)
    wait(0.1)
end

The problem stems on line 10. I want the gui to show up when the player is close enough, the gui is not in the player's PlayerGui yet, and the player is facing the object (not behind it). My problem is finding out how to define that third qualification. I've tried making the script check the Player's position on the x axis and determine if they are "in front of" the object. The output says that Vector3 is not a valid member of Position. How do I access that x value in Position?