electrical issues with the 67 fish

Back again, I made some go0d progress today as well. I pulled the cluster and tested all 3 gauges with a battery as suggested. All three had positive movement. The pc board is in excellent condition as I had already cleaned it up. Seems like the voltage regulater in the Fuel Guage is bad? I also tested all the sending units with positive results. I also found no ground on the fuel sending unit so I will add a ground next week as I am replacing the sending unit with a new gas tank. So where do I go from here? I also noticed the right turn signal bulb doea not light up which is on the same part of the PC board the gauges are on. The signals and hazards now work since I replaced the flasher units on both. Thanks again and looking forward to your reply.