Stop in for a cup of coffee

Mattax said
That's an ammeter. It shows current flow.
Voltage doesn't flow. If it was the tap water system in your house, its the pressure. The water meter shows the gallons used, and if you timed it, that's the flow rate. The ammeter shows the gallons/per minute to bring your battery up to full, or the gallons/minute its providing to run the car.

thanks brother, i understand this, exactly as posted, was wondering if i can change it to volt meter without changing the looks, where the charge deflection on the right side could represent voltage NOW instead of amps and discharge represent something like less than 12.5 volts