Your 2016 Cultus has a cable attached to the Transmission which mechanically check on speed and the mileage!
If you need to install a Digital Speedo you will require an Electronic Speed Sensor attached instead of the Speedo Cable to the Transmission. Similarly The Car has a Temperature Sensor near the T-Stat Valve Sending readings to the Gauge that will be changed to a newer electronic temperature sensor connected.
What exactly do you want to do?