I have been searching the forums for a while now, looking for an install guide for adding a push button or rocker switch into one of the blanks left of the steering wheel on a 2014+ Mazda 3. My end goal is the have a power inverter mounted in my trunk so I can charge my Boosted Board while I'm driving around. I don't want the inverter to always have power running to it, draining the battery, and don't want to have to unhook the positive every time I'm not using it. Is there a write up on an OEM switch replacement or one that would fit the slot and offer an on/off capability? Thanks for any and all advice!