I have a speedometer that doesn't work on a 1994 Buick Century. I took the car off the road for the summer and just put it on the road for a winter beater. I replaced the speed sensor and also the speedometer assembly unit. It worked OK for about 2 weeks. Now it doesn't work again.
When I start it, the speedometer does go up to the 5 MPH mark as it usually does when you turn on the key, but it doesn't move.
Any ideas what it could be? Could it be a short or something? I'm flat out of ideas.