I created a cheap "button box" using a external numeric pad. If your in r/trucksim then you will have seen my one i made for American Truck Simulator. Im a very casual/new
Button Box DIY - Page 5 - SCS Software
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Button Box DIY - Page 4 - SCS Software
Free "ButtonBox" for ETS2 Using Roccat PowerGrid | RaceDepartment
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DIY button box with ETS2 (with pictures) - Archive - TruckersMP Forum