PSI Standalone Wiring Harness | LS Wiring | LS Wiring PSI specializes in the design and manufacture of Standalone Wiring Harnesses for GM Gen II, III, IV, & V LS/LT based engines and transmissions. These harnesses include the Gen II LT1/LT4, Gen III (24x) LS1/LS6 and Vortec Truck Engines as well as Gen IV (58x) LS2, LS3, LS7, & Vortec and GEN V LT / ECOTEC3 Engines.Vortec/Truck (24X) · Ls/Car (58X) · Ls/Car (24X) · Vortec/Truck (58X) · Lt1 · LS w/4L60E/4L80E LS1 Stand Alone Harness | eBay 1997-2002 DBC LS1/LSX Stand Alone Wiring Harness With 4L60e Transmission. 1 x 1997-2002 DBC LS1 Stand Alone Wiring Harness With 4L60e Transmission. The harness is built for the 5 wire LS1/LS6 Mass Air.. 1997-2006 DBC LS1 STANDALONE WIRING HARNESS With T56 or Non-Electric Trans. In Stock for SAME DAY SHIPPING! $500.