[TR] Oil Pressure Switch Wiring

[James Mague]

I am trying to figure out the wiring diagram for an oil pressure switch.  There are three electrical connection labeled:  P, S, and I.

 
I have two wiring diagrams that conflict and I have some hand written notes that conflict with Dan Masters book.  This is what I have on the car:  P--Black, S--White/Brown and I--White/Purple.
 
Anybody have the correct way to wire the switch??
 
Thanks
Harry M
74 TR6
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