Hey Alfred,
All the wiring diagrams are for 'manual cars' even the ones in the BBB.
#24 on the wiring diagrams is the 'back up' light switch.
I agree that the 'starter lock' AKA 'neutral safety switch' should be in that wire to the solenoid of the Starter.
Bob Smith (Brisbane,Australia)
RHD,1967 early 250 SL, auto