You don't want any power going to the starter solenoid or the injection pump. I have no idea how an immobilizer works.
I was thinking of putting that in my car... just for the sole reason that the lights can stay on after the key is out!!! I don't know how many times that has left me with a near dead battery (rushing to work, then running in.... forgeting to turn lights off... or radio even... lol) Your best bet is to just buy the heavy 5-6 gage wire from a hardware store, and connect that to your battery and run it behind the firewall to the fuse panel.. then you can connect whatever kinda gizmo (I was going to use a switch, connected to the ignition.... somehow!!!)
Don't spend too much on an immobilizer, anyone with half a mechanical brain can bypass it in 2 minutes on an IDI engine. They do have to know an IDI engine when they see one though.
Yeah, but if you get carjacked you can kill the engine just before they are in the middle of an intersection running a red light with a transport coming.Steve