Hey 68 Coupe
Did the kit from Mustang Project have just the led plate and attached wires, or did it have the housing and lens as well? My 67 has been converted to have the original reversing lights now as indicators with amber lenses, stop/tail lights are just that, and I have no reversing lights. I had toyed with the idea of wiring up the (current) indicators as indicator/reverse using the twin contacts already there in the housing, a twin filament bulb, and extra earth wire, with the current amber lens. The reversing lights would be amber as well but it worked OK on my old Kingswoods.
This kit would save a lot of st#ffing around.
I don't want to go adding extra ligts or changing the look of the car.
Did you have to change the flasher unit under the dash to handle LED's ?
Cheers