Nice work!! Glad you're gauges are up and running. Probably not necessary to drill out the rivets and remove the old regulator if they weren't working. I did it with mine just following the steps @Pete in NH provided me.
You can buy the new tach board to replace your old transistor board, and it fits ight into the tach can and wires up to the factory wiring! I have it in my car!!! I'll bet that's the problem!
