recently I went back to a eg cluster in my 94 civic cuz the previous owner had put a gsr in, and never fit right. He had twisted the wires and I never had any speedo problems. I went out and bought the correct eg cluster harnesses and crimped the wires which all color matched. Basicly everything works except the speedo, its about 10-15mph off at times. When I first start the car and drive it works flawlessly, but after stopping and driving again the speed isnt accurate.

any help would be greatly appreciated