Well, our challenge was to get a tach that would read out our 14k rpm redlines without using a factory GSXR tach and harness as the wiring is a nightmare. After lots of searching I came across this company/website out of Utah:
http://www.speedhut.com My experience with them has been superb (great support and shipped as advertised) and every guage is made to order and warranteed for 5 years. Color of bezel, background, graphics, text, etc...can all be added, some for a price. You can have it lighted different ways as well. Their site is pretty slick. You decide what guage you want, say a tach, you choose the colors, graphics and so on and then you can see how the guage looks (even a night mode) before you buy it. I also found their prices to be very good, these tachs ran us $250 each which is $100 cheaper than anything else I found that would work. These tachs can be hooked up to any type of coil set up, number of cylinders, etc... All of the filters one would normally used are built in and switched with dip switches on the back, makes the set up much easier. BTW, the site has much better pics than I have or can take. If you're looking for a guage, certainly a great place to start, they make everything.