Might want to read this thread
Manual vs. Electronic Gauges. I went with the ISSPRO mechanical guage setup (pyro, trans temp, and boost) and really like them. Autometer and Diprocol (sp?) gauges are some other brands that are mentioned quite a bit. Running the wires isn't too bad, but if you get a pyro it requires that you drill the manifold and some don't like the idea of doing that.