Check out what just arrived from Innovate Motorsports - the SCG-1! It's a wideband controller and a boost controller, plus a boost gauge and a shift light - all in one package. Since it knows your air/fuel ratio, it will automatically cut boost back to the minimum if it senses you've gone lean. This gadget works on its own. Great for someone who has a turbo car and wants to turn up the wick a little. You can order them here:

Innovate SCG-1 wideband gauge / boost controller