PSI Conversion Performance Parts
LS/LT Swap Harnesses and More...
Due to Demand and Production Time, Orders will take longer to Ship
A PSI Harness is made with top quality material right here in the USA. Our customer service is second to none and can be reached by phone five days a week and emailed 24 hours a day. We have a combined 25+ years experience. Don't wait 4 to 5 weeks for your harness to ship. PSI LS Swap harnesses are always in stock and usually ship in 1-3 business days!
Due to COVID-19/ pandemic restrictions, some harnesses may experience an extended shipping lead time. Contact us directly for current shipping time estimates on a specific harness if needed
Looking for an Affordable, In Stock, Plug and Play wiring harness for your LS Swap? PSI sells 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. All PSI Harnesses are Made in the USA. In addition to wiring harnesses, PSI carries Holley Products, Vintage Air A/C, Dakota Digital Gauges, HPTuners and PCM programming, Fuel Pump Kits, Engine Sensors, Extension Harnesses, Replacement GM connector pigtails and a complete line of hardware to complete your conversion needs!
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