I have an '89 with the 140 mph speedo. I bought the car crashed with no computer. I bought a junkyard computer. The speedometer "works" when I go down the road. It moves, but it bounces around and is way off. I think that its the speedo buffer, but where is that located on the car. I think it's under the pass side dash, but I'm lost after that. What's it look like? Any ideas?