Above:  Me and my dog Cartman.  Below is the backside of the center dash gauge pod I just installed in the Beetle.  It has VDO Boost and Volt gauges, and an AutoMeter air-fuel (Stoich) meter.  Fun project.

I wired the gauges into a quick disconnect connector that I purchased at Radio Shack, so that the assembly can be removed quickly for access to the dash, pollen filter, etc.

Above is a shot of the Beetle's ECU under the left dash-top panel.  I had to tap into the gray and red wire to the front O2 sensor using a scotchlock or guillotine connector.  Never cut the wire and splice, as you could cause impedance problems and flag the check engine light.  I'll have a pic of the finished install here shortly.