Need Gauge help. Thanks

The regulator in the fuel gauge serves all gauges EXCEPT the ammeter. So if the regulator has a problem, none of the fuel/ temp / oil will work

This group should not affect the ammeter, unless it's so big a short (large current) that it draws down the system a lot

About all you can do is pull it back out and re-inspect. The condenser, which is only for filtering, might be a worthwhile suspect. At this point I doubt it's the only problem.