I am confused by some of the the responses.
1954 gauges were all 6v (the fuel gauge is the one where the voltage matters, if the truck has been converted to 12v).
The '54 gauges do not look the same as the earlier gauges but can be made to fit in earlier housings.
The '54 oil pressure gauge (this is not electrical) is for the higher pressure 235/261 engines ('54-'62 truck engines). The ammeters do not care if you have 6v or 12v, and the temperature gauge is not electrical.
Gauge clusters show up all the time on eBay (restored and unrestored). Most venders sell restored gauge clusters for all years, 1947.5-1955.5 (in original 6v or converted to 12v). If you buy used gauge clusters, be sure to find out if all the "sending units/lines" (especially oil pressure and temperature) are provided and are working.
Tim
