This harness is a 3 wire MAF and a 1 wire alternator.FOR DRIVE BY CABLE THROTTLE BODY ONLYStandalone Wiring Harness W/4L80E DBC Compatible With 4.8 5.3 6.0 GM LS Swap Vortec 1999-2003SPECIFICATIONSTHROTTLE: Drive-by-CableINJECTOR PLUG STYLE: EV1HARNESS LENGTH:StandardFUSE BLOCK INCLUDED: YesQUANTITY: Sold as a KitINCLUDED CONNECTORS:Fuse/Relay BoxFuel Pump ControlFan ControlsCheck Engine LightIAC and TPSMAF SensorMAP SensorEngine Coolant Temp SensorAlternator Control(2) Upstream Oxygen SensorsCrankfshaft PositionCamshaft PositionFuel InjectorsCoil PacksAutomatic Transmission ControlKnock Sensors