I'm using Autometer gauges. My boost and air/fuel mixture gauges are 2 1/16ths in size (diameter) and cost $50-$60, depending on the retailer. Both gauges are easy to hook up- the challenge lies in mounting them properly. For the boost gauge, tap into a boost source on the intake plenum side of the throttle plate (just like the rrfpr). The Autometer boost gauge comes with the necessary hardware and is illuminated. Use teflon tape on the threaded portions of the fittings.
The air/fuel mixture gauge has three wires- ground, power and 02 sensor signal. Pay attention to the installation instructions that come with your air/fuel mixture gauge. If you hook it up incorrectly, you can fry the unit. If you tap into the 02 sensor signal between the sensor itself, and the sensor connector, you should not encounter any problems. I mounted my gauges in the plastic din filler strip that is located under my cd player. Take a peek.
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