Where to get

Finally got most of my air kit. Now all I need is a 10 switch switch box, gauges and a tank. Where is the best place to get these at a reasonable price? Also for dual needle gauges,would I run 2 for all 4 cylinders? To me this would be more ideal so that I can get a pod or osmething like that so that I didnt have to custom mount 4 gauges. Also do they make air gauges in a 2 1/16 size taht will fit most of the pillar pods?