You are correct about the turn signals. Your truck was not equipped with them when new. It also probably had only one brake / tail light.

I drive all over the place using hand signals.

Surprisingly, turn signals weren't required on cars sold in the USA until 1968.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)