Changes not being detected in the movement of a player's torso in calculating a speedometer

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#1

I’m having an issue in getting the speed of a player’s torso for a speedometer. It’s detecting the player’s torso but it stops running once It gets to the Changed part (noted below) as I’ve figured out in debugging.

GUI Hierarchy

image
The LocalScript is disabled by default until the UI is cloned and placed into the player’s PlayerGui.

I apologize if it’s unclear, I tried to explain it as best as I could.

--SPEEDOMETER
function getSpeed(part)
  if part.Velocity == Vector3.new() then
    return 0
  else
    local dot = part.CFrame.lookVector:Dot(part.Velocity.unit)
    return (dot*part.Velocity).magnitude*(dot<0 and -1 or 1)
  end
end
--END SPEEDOMETER

--LP = game.Players:WaitForChild("LocalPlayer")

script.Parent.F.B.Delete.Activated:Connect(function()
	game.ReplicatedStorage.Vehicles.DeleteTrain:FireServer()
end)

if game.Players.LocalPlayer.Character:FindFirstChild("Torso") then
	print("Torso")
	game.Players.LocalPlayer.Character.Torso.Changed:Connect(function() -- <- HERE
		print("ok")
		local spe = getSpeed(game.Players.LocalPlayer.Character.Torso)
		print(spe)
		script.Parent.F.Speed.Text = tostring(spe)
	end)
elseif game.Players.LocalPlayer.Character:FindFirstChild("UpperTorso") then
		game.Players.LocalPlayer.Character.UpperTorso.Changed:Connect(function()
		local spe = getSpeed(game.Players.LocalPlayer.Character.UpperTorso)
		script.Parent.F.Speed.Text = tostring(spe)
	end)
end