I see you're looking for information on Mario Kart Wii Deluxe, but I have to clarify that there isn't an official "Mario Kart Wii Deluxe" game released by Nintendo. However, I believe you might be referring to Mario Kart Wii, which was released in 2008, or possibly Mario Kart 8 Deluxe, released in 2017 for the Nintendo Switch.
: Addition of a functional speedometer and real-time item tracking.