1994 - 1997 LT1 W/ 4L60E STANDALONE WIRING HARNESS 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. CPW - currentperformance ** These Harnesses are made to order please allow 6 weeks for order to ship** Note: VATS bypass module is not needed if VATS has been disabled via tune in the PCM. Built From Scratch Stand Alone Engine Harness. An engine management harness is pretty much what you will find from most wiring harness companies.