Using these RDX injector plug - and - play clips is a breeze. First, make sure your engine is off and has cooled down. Locate the area where the RDX injectors will be installed in your 2012 - 2015 9th Gen Civic Si. Take the full set of 4 plugs from the kit and simply plug them in where needed. There's no need to solder or crimp, so you can save time and avoid any complex wiring work. As for maintenance, keep the clips clean and dry. Check them regularly for any signs of wear or damage. If you notice any issues, replace the clips promptly to ensure the proper functioning of your RDX injectors.