Hurry! 70% Promo Code PSI Conversion 2026

Looking for an affordable, spot, plug and play harness for your LS exchange? PSI Conversion sells independent wiring harnesses for GM Gen II, III, IV and V LS / LT engines and transmissions. These harnesses include Gen II LT1 / LT4, Gen III (24x) LS1 / LS6 and Vortec truck engines and Gen IV (58x) LS2, LS3, LS7 and Vortec and Gen V LT / ECOTEC3 engines. All PSI harnesses are made in the United States. In addition to the wiring harness, PSI Conversion also provides Holley products, Vintage Air A / C, Dakota digital meters, HP tuner and PCM programming, fuel pump kits, engine sensors, extension harnesses, replacement of GM connector pigtails and a complete set of hardware Meet your conversion needs!