Jegs Mini Starter in 66 Wiring Question

[Steveoreno]

So I am installing a Jeg's mini starter on a 1966 327. I have it pretty well figured out with the exception of one wire....the pink one shown as "2". Originally the pink and yellow wires were bonded and I was directed to attach them to the " R Terminal" however there is no "R Terminal" on this starter. I learned that the yellow wire goes to the positive side of the coil and I have routed that and installed a diode at the coil. It was then secured to the opposing lug on the starter that provides power to the starter when the motor is turning over. The yellow wire will not be powered at any time other than when the motor is turning over. My question is...what is the pink wire? Clearly it is meant to be connected to a power source that is only hot when the ignition is in the "On" position so I cannot connect to the "BAT" terminal as I have done in the picture as it creates a parasitic drain on the battery....should I find a switched power source for it? What is its purpose? Thanks folks