For the MOT you do not need hazards, my 1966 I had a few years ago was never fitted with them, so a 58 surly will not need them. You do however need some sort of internal indication that the indicators are in operation, ie some sort of flashing light.
The indecators fitted to my car are a period accesory kit and are complete with an additional indicator stork, the end of which is a red beackon light. Similar to those found on early Morris minors and the like.
As you know the red light on the speedo is a constant when the semaphores are out.
"harveypj" wrote: