OK, that changes things a little as regards the rear sidemarkers. If you want them to flash, you need to trigger their control relays off the front indicator feed and either the front or rear position lamp feed. If you trigger off the rear brake/indicator wire, the rear sidemarkers'll light up whenever you step on the brake during the daytime, and they'll extinguish whenever you step on the brake at night. Not what is wanted.
If you want to change the '68 over to the Australian type setup with red brake/tail and amber indicator/reverse:
Cut the wire we'll call "1" that runs from the brake lamp switch "A" to the turn signal switch "B".
Your existing brake lamp wires at that point become your rear turn signal (only) wires.
Run a new wire from the brake switch "A" side of the cut wire "1", to the rear of the vehicle to power the brake lamps.
Cut the reversing lamp wire "2" downstream of the reversing lamp switch "C" ("downstream" means between the reverse lamp switch and the reverse lamps), and connect the reverse lamp switch "C" side of the wire "2" to the turn signal switch side "B" of the cut wire "1".
Now you've got some wire-switching to do at the back of the car:
The wire that formerly fed the bright (brake/turn) filament in your red lamps now feeds your rear turn/reverse lamp function in your white lamps, so move that wire accordingly.
Connect one leg of your new brake lamp wire (which you ran from brake lamp switch to rear of car in the third step, above) to the bright-filament socket contact for the red lamp, on each side of the car.
The original wires that fed the reversing lamps will not be used.
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