while at home... figured I'd install a volt meter to the rear plug-in compartment in my Vantage... this way I can easily check battery voltage and make sure my conditioner is putting out correct voltage...

about $10 in parts I had laying around and about an two hours all together...

 

Very nice handiwork!

I opted for the combo voltmeter/usb outlet that plugs into the cigarette lighter on the console. Found a nice one for $10.00 on Amazon.