My car did the same thing to me. The dash lights would flicker, only the speedo would light up sometimes, and when I opened the door the tach would light up. On day when I was driving the car started to jerk, and the it died. The car would not take any electrical load ot all, not even the reverse and brake lights would work at the same time. Turns out that I had a loose ground in the dash. If your alternator is putting out well, most likely a loose ground.
