Ah that's interesting. Being a Mayfair did it have a rev counter?
Yes it had a rev counter too. I think it was only the early 12" wheeled Mayfairs that had 120 mph speedos and I think orange needles were fairly unusual too.
I used to work on a lot of 70's & 80's minis during the 1980's and 1990's and was sadly a bit of a geek regarding some of these details.