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. 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

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‘97 - ‘04 LS1 LS6 & '99 - '06 Vortec (DBC) w/ 4L60E or 4L80E w/ EV1 Injectors & 5 pin MAF Standalone Harness

$549.00
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Cts-V Oil Pan Kit LS Swap

$330.00
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C10 & Square Body & Obs Swap Pedal GM Gen III Dbw 9 Pin

$100.00
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LS Exhaust Manifolds

$225.00
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LS3 (58X) With 6L80E/6L90E Engine Controller Kit

$1,295.00
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PSI C10 T-Shirtl - Wire It Up And Fire It Up!

$18.99
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1967-72 Chevy Pickup RTX Instruments

$1,325.25
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GEN IV Engine w/ 4L60E or 4L80e Standalone Harness

$659.00
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2014-21 Gen V 5.3/6.2 LT4 / L83 / L84 / L86 / L87 w/ 8L90E Standalone Harness

$1,179.00
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F-Body Oil Pan Kit LS Swap

$375.00
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Ls Engine Ground Kit

$49.99
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LS Swap Drive By Wire Throttle Pedal Bracket

$45.00

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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