The best methods are ones that make the thief work. Taking the cranking fuse is ok, but putting a locking fuel line to the pump is better. It will crank and run, but then die. Who wants to steal a broken tractor? Adding a relay to the starter solenoid so it will crank for 2 seconds, then reduce the voltage so the starter slows down and quits, then won't crank. Would take an team of electronics experts or a high school nerd 15 minutes to design, but worth while.
Getting a racer's quick disconnect steering wheel is a good thing too. Putting a pair of locking fluid lines, one on each of the lines to the steering cylinder is good. Turning the wheel all the way left (or right). Take the steering wheel and lock the lines. They they can only turn the steering wheel nub with a vice grip and with the lines locked, they can't straighten the tires.
I would also get a couple of the IR game cameras. Cover the vehicle approaches and the machines and HIDE them or they will get stole too!
Now for the fun stuff. If you were an electronic's expert, you could have an IR sensor detect a crook on the seat, then remotely have a laser pointer from way off turn on pre-aimed to be on the crooks chest. Leave a note on the steering wheel "if you see a red dot on your chest, you have 7 seconds to leave or die". You may need to wipe the smell off the seat ....
Getting a racer's quick disconnect steering wheel is a good thing too. Putting a pair of locking fluid lines, one on each of the lines to the steering cylinder is good. Turning the wheel all the way left (or right). Take the steering wheel and lock the lines. They they can only turn the steering wheel nub with a vice grip and with the lines locked, they can't straighten the tires.
I would also get a couple of the IR game cameras. Cover the vehicle approaches and the machines and HIDE them or they will get stole too!
Now for the fun stuff. If you were an electronic's expert, you could have an IR sensor detect a crook on the seat, then remotely have a laser pointer from way off turn on pre-aimed to be on the crooks chest. Leave a note on the steering wheel "if you see a red dot on your chest, you have 7 seconds to leave or die". You may need to wipe the smell off the seat ....