I've got the Percy's dual channel EGT. I put one probe on #1 and one on #6. I was hoping to get one bad runner cylinder (#1) and one average runner cylinder (#6). I've been mainly watching #1, but even in differential mode there's not much difference between the two. Mine seem to peak at about 1363F. I've only got six runs under my belt with it though so I'm still trying to learn how changes in the tuning affect the temp readings.
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Jeff Chambers
T/S #3
11.86 Seconds/113.8 MPH
Chambers Racing Team