BEST CUSTOMER SERVICE. They answer all my d*** questions and quickly. So glad I purchased my harness from PSI.
April 2021
My LS swap is a LS2 but with LS3 heads and injectors. Harness came with all the correct connectors. Tech support is super responsive and helpful.
October 2020
I stumbled across their website by chance, boy am I happy that happened. I had questions about LS swaps, mind you, I jave not purchased one thing from them. I sent a message to them.on Saturday, a few hours later I had a response. I would message them again and they responded, over the weekend. I highly recommend their... read full comment
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!
2029 Route 88
Brick, NJ 08724
(732) 276-8589
