finally putting the pins into the blue and clear plugs. down to the last wire. it is a PINK wire from terminal "B" on the auto trans selector shift/range plug ?, can't find any reference to it ! there is a yellow wire on term B of one of the plugs goes to 68 blue, but cannot find anything on these GMTUNERS sheets about the PINK "B" wire. ( there are 2 plugs on the selector /range mechanism, don't know which is selector & which is range) HELP ! Thanks

The pink wire goes to an ignition on power source. It is the power feed to your backup lights. Pin f on the range switch is the blue wire that goes to your backup lamps, since the range switch is your backup lamp switch.

C500 pin C1 is the switched power source for your back up lights.
C500 pin E1 is the wire that runs to the back up lights.

so, now I need to check the blue wire also. Am I correct that The RANGE Switch has nothing to do with the ENGINE Running ? Undoubtedly this wiring is the Hardest Part of the Entire Project, Thanks