Can Anyone Advise Me Where The Speedometer For The Tbs Was Manufactured

Don't know where they were made, nor do I know of any repairers for them. But ..... (there's always a 'but' isn't there?) classic bike magazines often have repairers of various odd bits advertising in them. A few minutes in W H Smith's could be time well spent - assuming that no-one herein can point you in the right direction. Otherwise I guess google is your friend. Used items may be available from breakers.

 

No idea if they made the originals but can likely supply lookalikes

https://www.caigauge.com/