I don't recommend this circuit. I'm not a car thief, but removing or breaking the panel they can find wich wire goes to starter and wich one do not.
A very old yet effective method is to connect in series the starter with any switch (i.e. lights), so the lights must be turned on before starting the engine. That's the secret key.
Anyway, if you're not an expert its a bad idea to take apart your car's electric system. If you make a short circuit you may burn the engine's computer, the starting system or something like that.