Ok so my alternator warning light comes on intermittently, the parking brake warning light no longer illuminates, the tach needle swings wildly up and down...yet my car starts and drives fine and voltage output looks normal? Any ideas to what the culprit is? I did try to disconnect the accessory (voltage, clock and temp gauges as I am replacing the console and noticed the old wiring is pretty worn out/fried) but I dont see how that would make a difference. any input appreciated..

Try wiggling the VR. I know, sounds too simplistic, but dirty connections between the voltage regulator and the terminals in the relay board can cause this. If a good wiggle helps, take it out and clean all the contact points. Also a time to clean up the the rest of the ground points as they can get krusty after enough years.