1968 Dart gauge help

I have these in each one of my cars. They work great. Voltage displayed when plugged in and amps displayed when you plug your phone in to charge.

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Thanks Mike.
That must just be amps to through the USB connecter to the phone.

I think there may be enough room to give the gage its own mounting nuts. Maybe with a drop of locktight.
But figured he might want some options.
And besides its nice to be able to get voltage reading even when the ammeter is working.