This cable has a 12 pin OBD1 connector shell to plug in under your cars dash to interface to your cars ECM. This cable is the most convenient to use if your car is equipped with the 12 pin connector style, as it allows you to just feel under the dash to plug it in. See our GM OBD1 home page for references and diagrams of the connectors styles.This cable works on cars that have the serial data pin on pin M or pin E of the GM 12 pin OBD1 ALDL connector, which is most every 1982 to 1995 GM car. Pin M indicates 8192 baud and pin E indicates 160 baud rate serial communication speed. If you have some other connector configuration other than the GM 12 pin (such as Lotus cars) or a mid-1980's GM car with the serial data on pin D, buy the bare pin cable. If you have the GM 16 pin OBDII style connector used on some 94-95 OBDI cars, buy the 16 pin cable.
