Lights flicker and gauge jumps around???

Thanks for the suggestions. Belts are tight. I don't have the amp meter anymore. I converted the entire dash to aftermarket mechanical gauges and installed a voltage gauge. The article in the post by 67Dart273 is exactly what I did to eliminate the amp gauge and install a volt gauge. Wire from alternator is new 10ga wire. All of the wiring in the engine bay and charging system is brand new. I will check out the alternator and try another voltage regulator.