multiple dashboard warning lights on

I have a 2016 Hyundai Tucson 1.6 T-GDI 177 4WD EXECUTIVE DCT-7 and I'm having some issues with it. The speedometer and tachometer are not working, and there are multiple dashboard warning lights on, including ABS, anti-collision system, engine light, and others. Additionally, the automatic transmission is malfunctioning.

The vehicle is currently at the dealer for repairs but unfortunately he cannot find the cause.

I'm hoping someone on this forum can help me out with this problem. Any advice or suggestions would be greatly appreciated!

I thank you in advance .