I just bought an autometer boost gauge from Summit, I got it really fast. My buddy is also ordering a tach, water temp, oil press, boost, and one other that I can't remember right now, all autometer, from summit.
Check out Blue Oval Performance. He sells on ebay and has great prices and customer service. He would probabley give you guys a good group rate. He is about 45min from me and I have bought several parts from him including the KB.