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The only case in which having gauge displays and also having a tuner hooked up, would be mutually exclusive, would be if the gauge displaying hookup used the same input or 'jack' on the Kenwood Excelon device, that the tuner would use.
If you have any trouble deciding how that affects the subject-matter of your question, please let me know what kind of tuner (Sirius/XM adapter perhaps?) you would contemplate using. (I'd also be interested in what sort of gauge-interface kit you'd be using, but that info is less essential I think.)