I have a dash cam I'm happy with. However, the camera takes a 12-V power supply from cigarette lighter adapter. Because I'm keeping this thing forever and it's on constantly when I drive, I would rather not use up that plug and have wires running all the way up to the windshield. Is there a way I could tie into something in the engine compartment and just run the power cable through the firewall? I can't tie directly into the battery because I want it to only get power when the car is on, just like the cigarette adapter. I want it behave like that and only come on when the ignition is turned on.