So the sender was threaded 10mm metric, not BSP?
12 mm metric to BSP are easy to find, I have used them to fit oil pressure gauges to my airheads as all the twin senders I could find had a BSP thread.
Getting one with a 45 degree bend so the sender missed the frame tube was a bit harder, if any airhead owners are reading!
To be honest, I dont know, I just took the numbers from that message above. It was done by our restauration expert who can restore anything from any time to factory new.
So it was a safe bet that he could also fit this sensor into the bolt.
we covered it with silicone to avoid humidity - time will tell if thats any useful.
It actually looks quite sharp, I really like it. Clearly it is not VDO or Kienzle but those Instruments would have been well above 100 bucks ....
The housing was welded from an old pipe
And it works, on a 25km run with high and low speeds it went up to 95 C which I think is about right for this engine: