method to be the easiest and most efficient way of wiring your new ls swapped engine in the end it s definitely ideal to ensure all of your sensors are plugged in and wired correctly to ensure everything runs safely with the new swap if you are running a gen iv engine we have a harness ecm package for you if you are building a hot rod muscle car off road vehicle then our plug n play packages is as easy as 1 2 3 all wire harnesses are tagged and e with instructions all custom gen iv wire harnesses are professionally built to excede oem standards psi specializes in the design and manufacture of 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 2004 pontiac gto wiring harness info wiring harness.
info specific to the 2004 gto ls1 lsxharness adam will rework most ls1 vortec truck and f body lt1 harnesses hotrodharness purchase new harnesses for swaps vortec 4 3 5 7 7 4 ls