That told me that they were butchering the wiring on every brand new car that hit their lot. There's no need for butchering. All that's needed is constant 12V

That told me that they were butchering the wiring on every brand new car that hit their lot. There's no need for butchering. All that's needed is constant 12V. Maybe an aux 12V if you need to know when the car is on. At most, they may have installed a relay to cut the fuel pump or ignition, which is no more invasive than a standard alarm installation.