Ammeter Battery overcharge

The pic of firewall is to show where VR was mounted. I know shitty ground right? Ran great 4 years now though. Maybe time ran out on shitty ground?. New battery 2 weeks ago and new alternator 2 years ago.
Oh what started this was I could smell an odour and I knew right away to check gauges. Thats when I noticed an overcharging on factory ammeter.

Thanks all