I fitted my 37 1/2 with turn signals by buying a relatively inexpensive signal kit (that bolts to the steering column). I believe it was a 7-wire kit. It required a flasher. I already had a nice set of original fog lamps on the front. The kit allowed me to wire directly into these and into my stock taillights. It was a pretty simple add on and they work very well. I should mention that when I restored the truck, there was no wiring left, so I rewired for 12V.
Good luck.
Jim
