Ideally you will have both an ammeter AND voltmeter (my old Kenworth has both...). This gives the most complete information on operation of the charging system. However if I can have only one of the other I prefer the voltmeter.
A voltmeter is easy to wire - no heavy wiring needs to be brought to it as with an ammeter. (Only a single light gage wire + ground are needed).
Depending on the resistance of the voltmeter it's OK to leave it permanently connected. (A good, high resistance voltmeter's current drain is much less than the self-discharge current of a good battery)
However it's easy to wire a voltmenter to turn off when shut down: Simply connect the + post on the voltmeter to either the IGN or ACC terminal on the ignition switch.
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