Using these OLM Evolution tail lights is easy. First, since they are plug - and - play for 2015+ VA platform Subaru WRX and STI models, just connect them to the existing wiring in your vehicle. If you want to change the turn signal mode, there's a switch in the wiring to quickly switch between the standard on/off and sequential modes. When it comes to the tail - as - turn function, you can skip the amber turn signals and use the brake light as a turn signal. For maintenance, keep the tail lights clean by wiping them with a soft, damp cloth regularly. Avoid using harsh chemicals as they may damage the lights. Also, check the load resistors from time to time to make sure they are working properly and not affected by condensation. Remember, these lights are designed for US spec vehicles, so ensure your vehicle meets the requirements.