The best ideas aren't going to be here....now are they. I won't tell you exactly what I did on mine, not even my mechanic knows. But, on my last one, I used two switches...One to cut the power to the FITech computer, the other to cut the fuel pump. If I was leaving it parked, I'd use both, but for day to day running around, the fuel pump was fine. I also switched wire colors under the mat, so if you found the switch, and went to the firewall and found the corresponding wire color, it actually went to something else, so you're going to waste a lot of time....The GPS tracker is really something you should consider. Unless it goes underground or in a shipping container, you're going to get it back...Not many people expect one on an older vehicle, and a lot of insurance companies will offer a discount if you have one.