denso alt. install question?

couple of quick questions. in the near future i'm gonna instal this denseo alt. bought the mount kit and pig tail from arengineering. the car already has the crackback amp gauge bypass kit which means it has a wire from the alt. stud to the starter relay stud.

question 1: concerns the 12v reference wire (Blue wire on the plug and marked "S" ). would it be ok to just loop that wire to the charging wire on the alt. instead of running it all the way to the starter relay? seems like it would be the same thing.

question 2: where do you think is the best place to pick up a 12v key powered wire? isn't one of the stock voltage regulator wires 12v key powered? i can't remember. i have a diagram somewhere around here but have to go find the damn thing..

alt. directions.jpg