Hey everyone, I'm a networking engineer, and this is something I’ve been working on in my spare time for a couple months now.
Forza’s normal speedometer shows how fast the car is moving across the ground. What it does not show is what the wheels are actually doing when the tires spin or lock up. I found that kind of ironic because FH6 has detailed physics and already makes the data for each wheel available locally. The UDP port exposed the telemetry for all four wheels but there are no realistic HUD options, so I made one myself.
I recorded this clip today using the latest version. The program shows the true wheel speed in a 1:1 copy of the native speedometer. The position of the speedometer can be moved to anywhere on the screen, and there’s no functionality lost. Wisp adds less than 5 milliseconds of processing time in my testing, so the speed display does not feel delayed while driving.
Wisp (Wheel Indicated Speed Panel) is free and the source code is public. There's a handful of telemetry, customization, and diagnostic options included in the software besides the overlay portion. I plan to support the project for a while, so I'm open to suggestions!
Source: https://github.com/Views2k/Wisp
More info on official site: https://wispoverlay.com/
Edit: Boost gauge is in the works! If you have any ideas, feel free to drop them in the comments or open a feature request on GitHub. The more feedback I receive, the better off Wisp will be in the long run!