like someone else mentioned, a fuel pump cutoff is pretty much fool proof. Unless your switch is found, the car straight up will not start. No matter what's done under the hood. I've seen everything from simple places like a literal switch in the middle console (on a del Sol) to super hidden. On my old sol, I had my switch wired to a spot on the floor beside/under the driver's seat. I had to slide my hand down between the seat and the console and click it. It was also a very small switch that I used, so that even if a potential thief found it, there was a pretty good bet they wouldn't know what it was. Also had locking hood pins (heard that a guy came out and his hood was popped. intake go bye bye). And a CD player with a removeable face plate is usually sufficient deterrent in Athens/Atlanta. It's a lot of trouble to get a new faceplate, especially without a receipt or something showing you are the owner of the HU.
If you want to know how to do a fuel pump cutoff switch,
www.teamdelsolwa.com has a howto section, and it's in there.
