Sim Racing Dash for Forza H4 is a telemetry app for Forza Horizon 4 (Xbox One).
This app allows to display telemetry data of Forza Horizon 4 by UDP communication with Xbox One.

When this app detects Forza Horizon 4 (Xbox One) on the same wireless LAN, it starts UDP communication and receives telemetry data from Forza Horizon 4.
Please enable UDP telemetry in Game Settings.

You can receive the following telemetry data.
・Engine RPM
・Throttle
・Brake
・Gear Position
・Speed
・Lap Num
・Car Position
・Fuel
・Current Lap Time
・Last Lap Time
・Best Lap Time
・Tire Temp
・Current Engine Power
・Current Engine Torque
・Current Engine Boost
・Car Class
・Current Performance Index
・Drive Train Type
・Cylinders Num

Here is the demo video of this application.
https://youtu.be/e7mVogabvK8

Have fun!