I havent installed a push button start but in the ignition harness(the cars wires not your button wiring) the RED,YELLOW AND PINK WIRE are below. These wires are real stiff and bigger than the others and very hard to work with. When you think that you have found the wires test them with a volt-meter.
RED- in the ignition harness, this wire has a constant 12 volts (hot all the time)
YELLOW- in the ignition harness, this is the starter wire, this wire shows 12v only when the starter is cranking.
PINK- inthe ignition harness, this wire shows 12v when your ingition is turned on just to the front click.