the light that goes into the dash bezel is 1 wire so it has a power wire no ground this car was orig 3 spd so i put the hole in the dash in correct location and the correct harness for trans up to wiper motor even in wiring diagram shows a ground symbol but no details theres a 70 dash complete on ebay for sale shows reverse light just isnt clear enough to see what they used or did Thanks Dan
Dan,
In 70 there are two wires that run to the light. One purple and the other black with a white trace.
I just checked this on my unrestored 70 GTX
M
