Given the price of failure, might want to consider an aviation quality CO monitor..

The Guardian cigarette lighter model looks like a reasonably priced, good choice.. This unit increases in sensitivity as you go up in altitude. The increasing human sensitivity to CO at higher elevation is something to consider, especially for folks who like to hang out in the Rockies at the higher elevations.

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http://www.sportys.com/acb/showprod...mp;CATID=178&ObjectGroup_ID=1162

Found a whole pile of CO detectors when searching for the cheapest place to buy the Guardian unit here.. http://www.shopwiki.com/search/CO+Sentinel+Carbon+Monoxide+Detector

2000 4Runner,V6,Auto,31's, Sliders, Skids, On-Board Air, Air Shocks
Related Interests: Welding, Ham Radio, Road Tripping (Blue Highways), High End Video/Audio Systems