Hello there, its been awhile.
Two mods went down some time ago was the installation of a parts house voltmeter in lieu of the factory ammeter and associated printed circuit modifications.
Closely related was a mod to the chassis wiring harness to place a modern, positive fit style 10 pin disconnect instead of the factory disconnect which is prone to ripping the pins out of the delicate PCB.
The voltmeter mod was pretty straightforward, just some simple reorientation of things after the guts were taken out of the voltmeter gage housing.
Dont forget to connect your ammeter leads back together with a good mechanical and electrical connection, and insulate that garbage!