This is, to me, a really important subject.
Our flasher warning lights are too weedy to be of any use, and in an OTS at least the clicking from any relay I have ever come across has always been drowned out by wind noise.
I have had adjustable-delay beepers (some guy on Ebay ?) on my motorcycles and scooters for over a decade, because leaving indicators working beyond the intended signalling period on those can be lethal, but whilst they are surprisingly audible, even on a TMax, I found those beepers to be drowned out in the Jag, certainly at any speed.
And they don’t sound appropriate for 1962.
My solution came from Simon at
https://www.bettercarlighting.co.uk/ or
mailto:
enquiries@bettercarlighting.co.uk
I think it is this.
https://www.bettercarlighting.co.uk/ind ... ductId=546
He calls it a « Sounder » for search purposes.
It is a pretty Heath Robinson little Bakelite or w.h.y box, which contains a solenoid that simply bangs away on the side of its box ; about as unsophisticated as it gets.
It makes a right racket, tho this can be tempered by providing a softer « anvil » in the form of a rubber strip or similar receiver that you glue opposite the mechanical hammer.
I actually ended up using it brut, as delivered.
Once behind the dash it is not ridiculously loud, and it has an appropriately period mechanical knock that I find concentrates the mind wonderfully when you are changing lanes on the motorway.
You can’t ignore it, you will never forget to turn them off, and aside from queuing in traffic, where it can be a bit tedious, I think my car is much, much safer thus equipped.