Question: Ignition and T4 universal wiring kit

I'm replacing the wiring harness in my Cuda with a T4 universal kit from Northwest Autowire. I've ran into a little snag from the start having to do with the ignition. I've got after market gauges and an HEI distributor (if that matters) and I'm wanting to keep the stock ignition switch. The guide states to hook up the large yellow wire to the ignition run/accessory terminal then link it to the red wire to the battery.

I guess my question is which terminal to use. My 66 has 5 on the ignition switch. Battery, Start, Run, IGN1 and IGN2.

Should I just replace the ignition switch while I'm here or do I need to bridge terminals? I know the old wiring required IGN1 and IGN2 for two separate phases but considering that no longer exists, I'm not sure which way to go.

Thanks in advance.

Ant