57 Complete wiring system, 6 cylinder Chevy Truck. This harness replaces the original wiring in 1957 Chevy truck with a near-original harness which is 12 volt based. Includes the addition of directional lights and factory options. This harness is not an exact replacement but simple updates are built to original specifications. NOTE: This harness is built to original specifications with wiring for directional lights and options.