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One gauge would suffice, but only to a point. This morning when it was 30 degrees my tank pump was pushing 6.5 PSI, after a 2 hour errand run around town the diesel was nice and warm and it was pushing 8.5 PSI. Temperature makes a big difference! That is why I chose 2 gauges so I could...

My pressure readings are after the tank pump and before the IP gear pump. The higher pressure gauges come in after the IP gear pump. Not every pressure is going the be the same between trucks, there's many variables that come into play.

It typically runs between 5 and 9 PSI depending on fuel type and temperature. A new filter has about a 1/2 PSI drop and when it gets up around 3 I start noticing power loss.

I put a digital gauge on the inlet and outlet of the primary to monitor the pressure drop(that way it don't have to change my filter in a parking lot) it's been working well. Right there with you on EGT and Boost, put those in at the same time!