I spent some time looking at this and then put it on the "back burner" to deal with other stuff (like me screen I cannot seem to finish)Originally Posted by DK888
here are some links I found.
http://www.automobile-security.com/default.htm <---- They sell this sort of thing minus the computer
Replacing key ignition
I have to look back over it, but the biggest problem I saw (and others) was that if the system is dependent on the computer, you need A) power to the computer before the car is started and B) If something goes worng with the computer then you cannot start the car