This depends on the chassis type and engine. Vehicles transmit data from a multitude of sources that include the engine, the drivetrain, and the instrument cluster by using a communications protocol. There are many possible protocols that are used by the various manufacturers and component suppliers of the vehicles. The GO device can detect all of the vehicle data communications from the engine, the drivetrain, the instrument cluster, and other subsystems that may be installed. The customer will then have access to the richest collection of information from a vehicle that is possible. The GO device listens to the ECM for data to be broadcast. If the engine data we want is not broadcasted, we will poll the ECM to try to retrieve the data.