Help with master disconnect wiring

[aston@ultrasw.c]

I thought it would be a good idea to install a master disconnect switch.

Having a later car with an alternator there is some extra wiring involved.

In this case I need to route the power from the ignition switch to the ignition coil through the disconnect.

I have studied the wiring diag and poked around with my meter, but I can't figure it out

I think I need to splice into a red/black wire coming from the ignition switch. Well there's three of them: two smaller gauge and one larger.

See pic below. I am referring to the bundle on the left.



Can you help, before I get really pissed off