There are many ways to track your vehicle but the trick is to stop it being taken in the first place, oooor make it findable very quickly indeed!
Fit a tap in one of the brake lines press brake pedal turn tap brake on and one end are locked on, it will be very difficult dragging an 80 down the road with a set of wheels locked, unsure about insurance, I know some are sensitive to this subject so will go no further. But if you need more info Google 'Line lock', I run an electric one to the front wheels on my 1/4 miler Jaguar years back.
One of my favourites is something you can make yourself which is a latching relay. Look it up, you switch on the ignition and use a touch button, or reed switch (my favourite), and the ignition all lights up and you drive off. The moment the ignition is switched off the relay latch releases, the car is now dead until the sequence is run again. The magnet idea is good because the reed (thinner than a matchstick) is glued behind anything the magnetic force can penetrate, it could be right in ftont of the thief and they would never know it, and as the driver you can never forget to set the relay, turning the key off does it for you.
Now how about getting your car back quicker.......really quickly? Again using the latching relat method let's imagine the thief bypasses your ignition which to be honest if they got that far then they have some skills. So they drive off down the road and at a time set by you the fuel pump cuts out, you determine when it would be most inconvenient, perhaps the three minute drive from your home to a busy intersection, the next time the brakes are applied and the timer is active the motor stops, a busy junction, the middle of the road, it matters not, the theif will not be faffing about under the hood trying to get the motor going, and of course the car will be stopped somewhere attracting plenty of attention as the alram is now sounding.
This is easy (read very) and can be made up with very basic skills, and no don't ask me, I lack the patience these days.
Remember this is custom stuff and once you have fitted it you will know how to bypass it even if in the middle of nowhere.
Regards
Dave