Forza Horizon 6

Setup

1. On main menu, press Options
2. Click HUD and Gameplay, then scroll until Telemetry tab, the last 3 options
3. Change the last 3 options: set DATA OUT to ON, set DATA OUT IP ADDRESS to 127.0.0.1 and set DATA OUT IP PORT to 5300

Start and close automatically on Steam

1. On library, right-click on Forza Horizon 6, then click Properties
2. In general, set on Launch Options "C:\Path\To\RacingDSX.exe" --nogui --exe-attach %command%