The gauges I have in my care are red and white. I believe blue is also available but I do not have that color. The color is not changeable but the brightness is. I use the gauges in my race car and I like them because they are programmable and you can set upper limits to give a warning both audible and a red light on each gauge. I prefer the white gauge faces as they are easier to see during the day time. The first one I purchased was the red one and I tried to exchange it for a white one but they weren't going for that.
I have the Defi Link which is required to run any of the gauges. I have a boost gauge, a water temperature gauge and an oil temperature gauge. I also have a Defi Display which I use just to display mainly oil pressure but I also use it to program my RPM shift limits, via a shift/warning light. The nice thing about the Defi Link is that it will record the maximums of all the values which you can recall once you are off the track including maximum speed which it gets from the ECU as well as well as the RPM. Overall, I am very happy with them though they are pricy. To be honest I do not recall the exact cost but over $100 for each gauge as well as the Defi link.
