PSI | Standalone Wiring Harness | LS Wiring | LS Wirng Harness | LSX Harness | LSX Swap Harness | LS | LSX | LS1 | LS2 | LS3 | LS7 | LSA | LS9 | LT1 | Vortec | 58X | 24X | Swap

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.

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GM LS Swap Oil Pan Black - Additional Front Clearance

$415.00
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1979-87 Chevy/GMC Truck RTX Series Gauge Cluster

$1,495.00
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PSI C10 T-Shirtl - Wire It Up And Fire It Up!

$18.99
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Universal Six Gauge Round, Analog VHX Instruments

$895.00
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Gen 4 (58X) LSX 2007+ With 6L80/90E Engine Controller Kit

$1,295.00
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Gen V LT1 Engine Controller Kit

$1,650.00
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TERMINATOR X MAX EARLY TRUCK 24X/1X LS MPFI KIT WITH TRANSMISSION CONTROL

$1,599.95
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TERMINATOR X MAX LS2/LS3 AND LATE 58X/4X LS TRUCK MPFI KIT WITH TRANSMISSION CONTROL

$1,599.95

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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LS/LT Swap Harnesses and More...
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