Yeah I kind of though that it was in the unit as I know devices such as the tach and the speedometer are self-resetting at a pre-determined position. Jriichker got it right 19865.0, If the cable did stick, malfunction, break, or whatever, the needle would have more than likely reset itself back at 0. The problem has to lie in the speedometer unit itself.jrichker said:If the speedo cable messes up, it won't cause the pointer to stick. The pointer has no direct connection to the speedo cable. It uses a drum with magnets on it to couple to the pointer. The drum turns and tries to twist the circular steel disk that is mounted on the pointer spindle. The magnetic force is all that connects the drum to the circular disk.
Look in the yellow pages for a Speedometer shop, or plan to make a trip to the junkyard.
But if the resistors or magnets went bad, then it wouldn't be allowed to reset itself. If it was the needle put on too tight, then at least the needle would flutter or have some type of flick of movement. If the cable was broke, it would go back to 0 and stay there. The speedo relies on varible resistance. They are not mechanically linked to the cable (they are not a 1:1 ratio). The cable has to turn many revolutions for even the gauge to start registering. So if this movement stops, then by default the needle goes back to 0. In order for the needle to register the cable must be in rotation full-time and moving in a fast rate at that. It cannot be the cable if something is still registering on the gauge. Something is making it stick in that spot and/or nothing is allowing the needle to turn inside the assembly.MSM0075 said:Check the spedo cable, It shouldent be the speed sensor cause it wouldent get 'stuck' it would just stay on zero. Never had white face gauges but that could also be a reason.
87'GTstang said:But if the resistors or magnets went bad, then it wouldn't be allowed to reset itself. If it was the needle put on too tight, then at least the needle would flutter or have some type of flick of movement. If the cable was broke, it would go back to 0 and stay there. The speedo relies on varible resistance. They are not mechanically linked to the cable (they are not a 1:1 ratio). The cable has to turn many revolutions for even the gauge to start registering. So if this movement stops, then by default the needle goes back to 0. In order for the needle to register the cable must be in rotation full-time and moving in a fast rate at that. It cannot be the cable if something is still registering on the gauge. Something is making it stick in that spot and/or nothing is allowing the needle to turn inside the assembly.
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