I have a grain truck. '48 and I want to modify the lights so I have kind of a sequential thing where first the turn signal lights go off and then the marker lights at the corners of the bed. Any direction where I can go to get the data to make it happen. Tail lights are undecided as yet.....may go original, or may go with '64 ford lights in the bed, or maybe 40 ford Chevrons. I know years ago, JC Whitney sold a thing to make turn signals sequential but that was 30 years ago (when they used to have a show)