goodevening
The Temp gauges are made by ARIC, they are 60.4mm (2 3/8) in diameter. the part number is MT1/AQ/TCL/183/180.
The speedometer is made by smiths, the part number is MT1/SM/25914/36
0 to 40 MPH, it is 82mm in dia.
The fuel oil gauge is Smiths, MT1/SM/type 498.F6
The lube oil gauges are smiths, MT1/SM, 0-160lbs, type A597
the air gauge is smiths, MT1/SM/ type A597, 0-160lbs
AEC tanks had oil gauges that read from 0 to 60lbs, (same type number)
the smiths gauges are all 50.8mm ( 2'') in diameter.
the best palace to look is the web site,
http://www.prewarcar.com/
Kind regards