How can I make a custom car gauge?

Can someone help me make a speedometer with a needle? I made my own simple chassis and I would like to make it so I can add a gauge to it! I managed to implement a simple speedometer! by detecting the player's velocity and I also used a free model called audio player gauge so the gui appears whenever I seat in the car! i modified the gui and used it for a speedometer! So How can I make a needle speedometer? I need someone to write the code for me since I'm a dummy! So please guide me I don't really know stuff about math.floor!