After Market Ammeter?
As much as I used to like ammeters I finally caved and went voltmeter.
Start by reading this MAD article, which covers a lot of ground as to inherent problems in these old girls
http://www.madelectrical.com/electricaltech/amp-gauges.shtml
This might give you some ideas if you decide to "do" a voltmeter.
http://www.forabodiesonly.com/mopar/showthread.php?t=119480
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