Here are a couple of books you should try to track down:
Ford GT40 by John S. Allen
Pages 34-35 show the cockpit of GT/108, and it can be seen that the gauges used in this car are Smiths
The Ford GT40: An Anglo-American Competition Classic by David Hodges
Page 106 shows the dash layout (for a RHD car, of course). Starting on the left, they are: Speedometer, Fuel Gauge (Left hand tank), Ammeter, Oil Temp Gauge, Water Temp Gauge, Tachometer (front and center, as it should be), Oil Pressure Gauge, Fuel Gauge (Right hand tank).
Oh, btw, GT/108 has no speedometer and the gauge layout is different. The layout shown in the Hodges book is most likely for a Mk III, as it shows a cigar lighter, and I don't think that was standard equipment on any of the race cars
[ November 14, 2002: Message edited by: Steve Toner ]