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Since the '65-'66 Mustang ignition switch wiring connector is not available as a separate item from the main dash harness, you'll need to use insulated female spade terminals to connect the dash wiring to the switch. We went one step further and created a small harness from the ignition switch using a four-pin Deutsch connector from MSD (PN 8187; $34.21). The wiring connections on the back of the ignition switch are, from the top (clockwise): ignition out (pink), battery in (red), start out (purple). The center stud is accessory power (brown), which we capped with a rubber plug for safety.