Installing reverse lights

I am installing Back up lights on my '68 P/U and i do not know where to connect the switch that is on the Shifter (Auto Trans.) The wiring charts show a Black wire and a orange wire going to the switch. I have a Black wire running to the rear body,which according to the charts is for the B/U lights. Thanks in advance.

Test the black wire you have (to the rear): touch it to battery plus and the backup lights should light.

The Orange Wire is then 12V ignition (check with a test-light).

Connect the two switch wires (as of pic) to the above wires: one to orange and one to the black wire and you should be good to go. It does not matter which way you connect both wires to the switch.

the lights in the back only have 1 wire so the light bezel has to be grounded to the body

dix is absolutely right. I assumed a stock wiring/setup in the rear. Ground is provided via the screws holding the backup-light socket to the body.

Yes,In this case Black is Pos.