A Series Of Electrical Problems

[blake918]

The other day on the hwy, I had the cruise set on 80, and then, the car starts jumping back and forth between 70-75 in a jumpy motion...then down to 60. I cut the cruise, and she maintained 80 perfectly. I haven't used the cruise since.

Also, the speedometer doesn't work when the car is first started (I'm not talking about the lighting but the actual speed reading.). A thump over the dash where the cluster is housed gets it going. And starting the other day, the ECT PWR light comes on when I turn on the headlights regardless of what postion the switch is in.

The car is a '94 with 135k miles, currently has a cel for an o2 sensor. The car runs and shifts beautifully and looks even better in and out, but I swear all of the electrical problems this thing has had...

Any guesses?? The only thing that comes to mind is the ECU or the cluster itself.