One thing, that could happen, is that you don´t get the correct speed, or that you need to get the speed from a different actor, like your car, if your char is entering a car.
In my case, i get the speed from the Mannequinn/person, but your video shows his mannequinn is entering a car, which would be a different actor. So you probably would need to get the speed from your car (if that is not the actual player), and use that to set the Speed variable.
One way to test, if you get any speed is to make the Speed array and the Speed variable instance editable, so that you can see them in the editor.
i just had increased it to 4 digits, so that it can be over 9000, thats why there are now 4 integers in that array.