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Im in Socal. There is a Golden State SHO Club but we havent met for a while. Last meating was at my place for a 60k upper end how to. I think this topic might get moved though.
You can get them from Speedhut at www.speedhut.com They are located in Utah but they have very good service. You can get the guages made any way you want and they are very nice and of good quality. They are well worth their price.
Where are you in CA? Maybe we can see about a meeting sometime in the near future. I need to take the SHO down to the drag strip.