Chevrolet C10 LS1 Swap Wiring Harness | Wiring Specialties This Universal Harness is perfect for Race / Track cars, cars running a stripped interior / switch panel, or classic pre-EFI cars with the GM LS1 Cable Throttle engine swap. It was developed in house on an actual LS1 engine to ensure a perfect fit to all engine connections. LS SWAPS: Wiring Harness and Wiring Guide - LS Engine DIY Mar 10, 2015LS SWAPS: Wiring Harness and Wiring Guide Includes in-depth instruction and photos. Covers all the criteria to consider when starting an LS swap project. (which uses a Delphi 45 plug), and the Flex Fuel injector (which is also known as the Z-style). LS engines are plug-and-play, so installing the harness is quite simple.