Using this SMY Modular Defroster Gauge Pod is a breeze. First, check your vehicle model. It fits 2015 - 2021 WRX, 2015 - 2021 STI, 2014 - 2018 Forester, 2013 - 2016 CrossTrek, and 2012 - 2016 Impreza. Then, when installing, make sure to drill a quarter - size hole in the duct inside the dashboard to run the wires. If you want to use AEM X - Series Gauges, don't forget to buy the SMY X - Series Adapters.
When it comes to the pods, you can use the two removable caps and add up to three add - on pods to fit up to four gauges. The mounting tabs and vent are designed to give you a perfect fit.
As for maintenance, since it's made of high - quality ABS plastic and has an OEM finish, it can withstand up to 250 degrees. But try to keep it away from extreme heat or cold to make it last even longer. It won't restrict the defroster's air flow, so you don't have to worry about that. And remember, it can fit gauges up to 2 1/2 inches deep, so choose your gauges accordingly.