one of my good friends has a 1972 stacked head light merc with a ford 5 litre V8 & he's just bought a set of Dolphin Gauges from the states. £200 all in delivered for 4" Speedo & Rev Counter & 2" Oil, Water, Fuel, Volt & Clock. They look the nuts. Very classic.
http://gemstreetrods.com/gauge_-_6_white.jpg