EGT Probe/Gauge

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to monitor your exhaust gas temps. you can tell a lot by your egt's. running lean and/or too retarded will cause high egt's, and running rich will generally cause lower egt's, etc., etc.
 
EGTs are very tricky for beginners to use for tuning - they're more useful as a warning that something is going seriously wrong with the tune (i.e. really high EGTs). Unlike AFRs (95+% determined by injector pulsewidth) from a wideband, there are many factors that influence EGTs which often makes it difficult to determine the exact cause without simultaneously knowing other information (injector pulsewidth/AFR, timing, resitrictiveness of exhaust side, ... ... ...)
 
quick run down...

assuming a WOT run...

stoich = hottest point
as you go more rich or more lean the egt cools down. its kinda bell curve shaped.
 
??? in all my experience, egt's get hotter when running lean, espcecially with too little timing........
 
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