Finished off the gauges this evening. Scaled the fascias down to fit and printed out a few test prints. I initially tried to print onto transparent water decal paper but found that the ink was not vibrant enough and did not show up that great on the black background. This was a shame as the transparent decal paper works a lot better then the white.
So unfortunately I was forced to use the white paper so that the green numerals were visible. This had one unfortunate side effect - that the white edge of the paper was clearly visible in a few areas against the black background.