hello, I have a 1993 altima gle with hud. its having troubles with the speedo, it works in the summer sometimes or in the winter but only after you drive it about 70 miles or till it warms up. it does work in the summer. I never can tell how fast Im going and it also dont move the mileage untill the speedo starts working. it there a senser on the tranny I can replace or is it something other?