Can anyone tell me how to install the ignited engine start button into an eg. I know this has probably been done to death with the s2k button but I can't seem to find one for the ignited one. The instructions from ignited says to:

Connect –4 to 12 volt when ignition is on
Connect –3 to the ignition starter wire. You can just tap into the ignition wire.
The concept is when the ignition start wire reaches a 12 volt source, your engine will crank(same points connecting as if you were starting with your keys)

I have no clue which wire to cut or tap off my civic. Can someone please help me. Thank you.