Here is the one I used, granted I modified it to fit in this location but the original version should fit (might need to trim the tabs off of it) in one of the switch blanks. I found another one that would work without modification but it was $50 and came from Australia.
Amazon.com: MICTUNING MIC-DV-077 LED Digital Panel Double Voltmeter, Rocker Switch Style Voltage Monitor Blue for Car Pickup RV Truck Dual Battery Pack: Automotive
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