You might want to take a look at Spa Gauges -
http://www.spatechnique.com/product_pages/dualgauges.asp
They are good quality, strong, and
accurate (even if a bit expensive), but have programmable warning lights and recalls. They even offer a dual gauge with digital Boost and EGT readings in either black or white faces with your choice of red/green or blue backlighting. They come in complete packages (kits) with sensors, owners manual, and wiring.
I have used these gauges in several applications, and definately recommend them if you don't have issues with metric units.
Something to think about.