I use voltmeter phone changers in all my cars to keep an eye on my alternator. It has saved me from getting stranded from a completed discharged battery. Amazon has all kinds this is just an example.
Interesting.... Seems to be a decent (and easy) way to monitor the volts.....
I took the brute force method and installed a voltmeter (and oil pressure gauge) when I restored the car... using a repurposed fuel/temp gauge installed in place of the clock (using Paul Cain's car as an inspiration).
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