This is something I'll never add, because:
- I don't think it's necessary. Why do you need to know your exact speed? You can tell if you're going slow, normal, fast, very fast. Why do you need to know your precise speed?
- It's not worth the development time. Especially due to the fact you can easily install one yourself.
- It's technically difficult to make a circular textdraw like in your image. If a speedometer was added it would just be a number, like how fuel is displayed.
- I don't like unnecessary screen clutter.
- It's more things for the server to process frequently, leading to more lag.
- It's more bugs to introduce.
- I'm willing to bet most people wouldn't use it. It would definitely be off by default.
- I would struggle to find space for it. That corner of the screen shows mission timers/information.
- I want to use that screen space for things in the future such as a vehicle health bar perhaps.
Thank you for the suggestion, I just don't think it's suitable.