electrical issues with the 67 fish

Ok Mr RedFish, I have begun to work the Gremlins out! After a good night sleep I went at it again today. The first thing I did was take apart my original relay switch. It appears that someone else had done a little solder work on the housing once before. I connected the relay out of the housing and used a proper ground wire and it fired right up with the key. YES! I then carefully put it back together and soldered a proper ground wire to the metal tab on the corner and grounded to the mounting bolt. All is good now. I proceeded to reinstall the instrument cluster ( w/ a good wire ground installed to the pot metal housing) and it still started. YES YES! Now I have to start with the gauge issues. The dash lights are lit but are dim. The only gauge working is amp gauge. This was also the case prior to removing the original cluster. I have also encountered a new problem in that the turn signals no longer flash. From what I have read and you have suggested I think maybe the Fuel gauge voltage regulator needs to be checked? I will also replace both flasher units as well. Let me know what you think. Again I thank you and everyone else who has helped over the past few days..