only flaw with that plan onionlover is youd be getting bum raped in prison for at least 15 years as youd almost certainly get life sentance with a long minimum term because judges/the law system in general hates vigilante action so it gets a disproportionately high sentance as an "example" to discourage it.
thing is if sentencing for ordinary folk was same as scumbags then more of us would be tempted to do vigilante action.
The tracker systems are good in most cases although IMO you need 2 systems, one monitored system so someone can go looking for your car, preferably a system the police use, and one system on a sim card etc so you can track it too.
Most tracker companies will NOT give you live updates and the police are busy enough these days that you almost certainly will NOT get a cop car tasked to find a tracker activation for several hours and if other shit is going on then you are low priority. Thats where your own system is useful to help you track it. Speed is of the essence these days, criminals are aware of trackers and will usually try to find a lock up quick so they can start stripping panels looking for the tracker. so sooner you have a static location the better your chances of finding the car before the system is disabled and car moved.
Also with two systems well hidden, hopefully they will give up looking after finding one system. All depends if they have advanced RF signal detection gear or not. Some these days have the gear to detect signal transmissions so can use that to determine if theyve got the devices. You just have to hope they find one tracker and assume thats it and not check the car again.
the good tracker systems have controllable outputs so you can shut off fuel pump or any other relay controlled circuit you choose. Can be useful if the cars been jacked/stolen from a garage working on it etc.