How do you connect and display a vehicles sensors speed status on a carputer or laptop?

How do you connect and display a vehicles sensors speed status on a carputer or laptop?
You need an OBD2 reader which plugs into the standard socket fitted to all modern cars. Typically, this will have a USB connection which you plug into the carputer or laptop. You also need software to display the information on screen. Check the OBD2 Link shown for a full explanation of how to go about this.