All E85 conversions I have seen use a male and female fuel injectors connector on what is termed a spider harness. Your factory injector is unplugged, and one connector of the spider harness plugs into the OEM harness. Then, the mating connector of the spider harness plugs into your stock injector. Here is how it works. The stock computer sends out a calculated fuel pulse. This pulse is diverted to the E85 box which adds a pre calculated percentage to the factory fuel pulse. That increased pulse goes to the stock injector. To go back to stock, follow the wiring until you find the dual injector connectors. Disconnect the E85 box and connect OEM connector back to your injector.