Dug out the wiring package with the ignition switch and here is the best info I have.
The back of the ignition switch looks like the picture you posted and has the same four terminals.
Battery feed = Red wire goes to battery terminal on starter solenoid.
Ignition feed = Orange wire goes to terminal #1 on the panel
Accessory feed = Brown wire goes to terminal #2 on the panel
Starter (center terminal) Lt Blue goes to terminal #4 on the panel. This wire is hot only when the key is in the engine crank position.
The original equipment ignition switch on the column drop only has 3 terminals for: