If I remember correctly, you strip - not cut - the black wire to expose some wire. You cut the yellow wire and take your ohm meter and measure the resistance between the black wire and the yellow wire on the ignition switch side. Do not measure it on the car side to black, you will not get a reading, and if you do it is just purly coincidence. You will not get a resistance reading unless the key is switched to the on or start position as well.
Once you determine the resistance, purchase a package of low wattage mixed value resistors. Simply mix and match a few of them in the pack to the resistance equivalent to the switch's resistance. Solder them all together and put them between the black wire and the non switch side of the yellow wire. I did not hook the yellow wire from the switch back up. Tape the end of it so it doesn't short out.
Start your car and you're good to go. Just tape up any bare connections and that is it. You have defeated the anti theft system of the car.
As I said earlier, make sure you verify which wire to cut and which wire to strip. I cannot remember which one it is off hand, but it does involve the yellow and black. Do not touch the white wire.