Interesting, I was told on my first drive of a plus 4 at the factory by an older gentleman of the sales/workshop that Peter Morgan had said that the speedo should be in front of the passenger rather than the driver! this is the case with our 1956 plus 4

DSC_0725 by Robert & Ali Davies, on Flickr

On our 1947 its in the centre
2015-03-28 16.33.16 by Robert & Ali Davies, on Flickr

Morgans 1934 MX, 1947 Series 1, 1956 +4 TR4, 2000 +4 T16
Triumph Herald 1969 13/60
Morris 1970