There are two types of trackers you can use for a car depending on your needs.
First option is the OBD tracker. This is the simplest to use. You just locate the OBD port in your car (usually under the steering wheel) and plug it in. The OBD port looks like a SCART socket on the back of your TV. There is now wiring involved as the tracker is powered from the voltage on the OBD port.
Second option is a magnetic tracker that can be placed anywhere in the car. You stick it to a metal panel using the powerful tracker magnet. You can either work off the power from the inbuilt rechargeable battery or you can wire to the car voltage using a voltage reducer that normally comes with the tracker