Designed for the 1997-2004 throttle by wire LS1/LS6 engines with 4L60E/4L65E automatic or T56 manual transmission. Harnesses do not include any emissions related connections. Includes an 8 circuit modular fuse block and GM color coded wires with labels for easy installation. This standard length harness allows four feet from the back of the intake manifold to where the fuse block and ECM mount. Perfect for those that plan to mount these components under the dash or in the glove box. Requires the following mating parts; ECM #12200411; TAC Module #12578953; Accelerator Pedal #12565643. Fuse block protects the following circuits: DLC B+, Driver Side Injectors and Coils, Dual 40 amp Ignition Relays, Fuel Pump, Heated O2 Sensors, Mass Airflow Sensor, & Brake Switch, Pass Side Injectors and Coils, ECM and Malfunction Indicator Lamp, ECM B+, Transmission and TAC Module. Includes connections for: Accelerator Pedal Position Sensor, Alternator , Brake Switch, Cam Position Sensor, Clutch Pedal Position , Crank Position Sensor, Cruise Control, Data Link Connector, Driver/Pass Front O2 Sensors, Driver/Pass Knock Sensors, ECM, Engine Coolant Temperature, Fan #1 Relay Ground ECM Activation, Fan #2 Relay Ground ECM Activation, Fuel Pump, Fuel Pump Relay, Fuel Pump Test, Gear Indicator Switch, Grounds, Ignition Coils, Ignition Switch Signal, Injectors, Malfunction Indicator Lamp, MAP Sensor, Mass Airflow/Intake Air Temperature Sensor, Oil Pressure Sensor, Reverse Lockout Solenoid, Skip Shift Light, Skip Shift Solenoid, Starter, Tachometer, Throttle Actuator Control Module, Throttle Actuator Control Module to Accelerator Pedal Pigtail, Throttle Actuator Control Motor, Throttle Position Sensor, Transmission, Vehicle Speed Sensor, VSS Output for Speedometer. PLEASE NOTE: This harness is standalone and is not intended to replace the OEM engine wiring. Standalone harnesses are intended to run the designated engine & transmission only, generally when swapped into another vehicle.