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Why PSI
Why PSI
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. PSI LS Swap harnesses that are in stock ship in 1-3 business days!
Due to COVID-19/ pandemic restrictions, and supply chain issues, some harnesses may experience an extended shipping lead time. Contact us directly for current shipping time estimates on a specific harness if needed. Due to demand and supply chain issues, we are experiencing longer lead times; Please contact for exact ETA as needed.
LTX Gen V Guide
LTX Gen V Guide
Trying to figure out what LT engine you have? Check the PSI VIN Decoder to decipher your engine information by VIN#.
LSX Guide
LSX Guide
Trying to figure out what LS engine you have? Check the PSI VIN Decoder to decipher your engine information by VIN#.
Featured Items
Featured Items
About
About
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!
My Account
My Account
Contacts
Contacts
2029 Route 88
Brick, NJ 08724
ph. 732-276-8589 Mon-Fri: 8:00am to 6:00pm ET
customerservice@psiconversion.com
sales@psiconversion.com
techsupport@psiconversion.com
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