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Hello, my name is***** will assist you with this.
The rated RPM for this engine are 2600, Cummins says that the crusing RPM is 200-400 less than max. Your best fuel burn is a between 2000 and 2200 RPM. Have a look at this data sheet.
For your gauges, I will need to know if it is the SmartTach or the Engine Monitor or SystemView.