Air/Fuel Guages have become less expensive and more readily available.
A [Google search | http://www.google.com/search?hs=65V&hl=en&lr=&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&q=Air%2FFuel+Ratio+Gauges&btnG=Search] on Air/Fuel Guages will provide lots of choices.
Here are some sources, no reviews by users yet, just links.

[PLX Devices | http://www.plxdevices.com/] has both [hi-end | http://www.plxdevices.com/products_rseries.htm] and [less expensive metering | http://www.plxdevices.com/products_mseries.htm] solutions. They also have a nifty converter/linearizer for inexpensive OxygenSensors.

http://www.rbracing-rsr.com/partnumbers.htm#meters

http://www.dawesdevices.com/airfuelmeter.html (for turbo vehicles)

Air Fuel Ratio Monitors from [racerpartswholesale | http://www.racerpartswholesale.com/afratio.htm]

;: Stewart Warner Air Fuel Ratio Gauges
;: K&N
;: Uego 1000 Air Fuel Ratio Monitor

One that looks particularly nice can be obtained from [innovatemotorsports | http://www.innovatemotorsports.com/products/xd1.php] (a little pricy)

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If you have used an air/fuel gauge please add your comments.

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