As foretold, the first mod is done!
First, drop the glove box down. Press inward on each side of the glove box. There are tabs on the side that act as stops.
Next, we pull out the middle connector from the ECU. That solid orange wire is the one we're after, its the camshaft position sensor signal.
Now, we cut that orange wire, and put the kill switch inline with it. Solder things up, make sure to use some shrink wrap on it, and then plug it all back together.
The kill switch works perfectly!
I had previously tried cutting into the crankshaft position sensor signal and it did not work. I just got a check engine light.