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You'd want to see the highest temperature your engine sees, 4,5,6 will give you that reading.I contacted DieselManor to ask their techs about it they pretty much referred me to the install sheets that was provided in the kit. I know they say not to let the egts get above 1250 or thats about average for driving. Now the two gauge setup for egt 's is a good idea but which gauge would you be more conserned with the 1 that monitors 123, or 456.
1,2,3 will still be pretty close too, but as long as either is pre-turbo youll still have an accurate reading.