We've made upgrading fuel injectors extremely easy on our new KPower 86 engine wiring harness. All harnesses are shipped standard with OEM injector connectors (or others upon request), but they are attached to an injector sub harness that can easily be swapped out without any cutting, splicing, de-pinning, or sketchy injector jumpers.
Just unplug one injector sub harness and connect the correct one and you're good to go.
All sub harnesses are made with new connectors, Teflon coated wire, and Raychem DR-25 heat shrink loom.
Please check with your injector supplier to make sure you are ordering the correct connector. Some manufacturers use different Bosch connectors for different size injectors in their lineup.