No lights, only instrument working is fuel guage

Red fuse wire from battery to voltage regulator hot. Replaced voltage regulator and now only instrument working is the fuel guage. Fuel guage was not working before. When I first turned off the ignition the lights stayed on for a short while then dimmed out.

After I replaced the regulator there were no readings on the fuel guage. Upon putting gas in the guage went to full a short time later.????