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EGT and Fuel Pressure are the most important.
Your 07 already has a oem boost gauge.
Oil temp and water temp allow you to monitor the performance of your oil cooler (clogged oil coolers are a (theoretical?) cause of egr cooler failures).
Tranny temp is also a good parameter to keep an eye on, especially if you pull heavy with an auto tranny.
Beyond those, oil pressure, voltage, HPOP pressure, and coolant pressure (helps determine failing head gaskets) are all helpful.
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03 F250 6.0 XLT cc sb 4x4 auto 70,000 miles
11/02 Build Date, harpooned tank, high idle switch,
coolant filter, QZ Commander for gauges (bst egt fp tt wt hpop)
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