Thanks everyone for your input. I have had a quick look on ebay and the inverted leds mentioned are for sale. They seem to have red, blue, yellow and green (those are the ones shown). Gaz Thanks I was aware. I have also seen the indications on the back after I sanded down the gauge. The large ones (4' speedo/rev counter) say Smiths but the little ones (2' temp/fuel) say accessories limited. I will post some pics of the before, during and after work on the gauges :) Martyn