Got the speedo bracket together and mounted, it just peeks out from the front of the tank. Nowhere else to put it really.
It's not good engineering practice to fix things with one bole, but a shakeproof washer either side of the frame and 4 Shredded wheat before tightening should keep it in place.
Having said that, it is a truism that anything that you have to convince yourself will be alright, will bite you in the arse. There may be more on this at a later date.