I over-pressured the speedometer cable, and it tore the thing up badly, so I replaced it, and it still doesn't work. I can spin the cable by hand from the end that goes in at the transaxle, and it spins the speedometer, so it's aligned right, but it still won't work.
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Try checking speedometer cable by unhooking both ends and spin it by fingers, if cable is good both ends will spin, and guage could be bad or where it attacheas to transmission that part could be bad to.
if this is a datsun and not a nissan name plate then you need to check and see if the speedometer cable is sticking or binding.if it is you can remove the inner speedometer cable from under the dash you have to remove the speedometer cable from the back of the speedometer head and move were you can work on it under the dash,turn the inner cable by hand to see if you can feel it bind or turn roughly before removing it,pull the inner cable out from the outer cable wipe it down and as you re-install it lube the cable with a light grease all the way to within the last 2-3" and re-install to the speedometer head and drive to see if it fixes the problem.usually this fixes the problem however if it doesn`t then the speedometer head is the problem
The first thing you can always do is check your fuses. there might a blown fuse that need replacement.The 1990 Legacy has a mechanical speedometer . The speed sensor is a read switch in the speedometer head itself. So
if your speedometer is functioning ( needle working properly ) then the
internal read switch is defective. That requires replacing the entire
speedometer OR it can be a defective connection between the speedometer and the
ECU.If the speedometer is not working, then you can
have a defective speedometer, cable, speedometer cable adapter ( on the tranny
) or internal speedo gear in the tranny.Thanks. you can rate this solution and show your appreciation.
If your speedometer is not electronic, unfasten the speedometer cable from the back of the dashboard instrument assy. Replace the odometer & speedometer unit with another one. Reconect the speedometer cable. This should do the trick.
HI. If your speedometer needle doesn't move, or if it flutters, your speedometer cable may be bad.
To determine if it is the cable, disconnect the cable casing from the transmission and from the back of the speedometer on the instrument panel. Draw the cable out from inside of the casing. The cable looks like a twisted piece or wire. If the cable is broken or if it is dry or brittle. It probably needs to be replaced. If the cable is intact and the same length as the cable casing, the problem is likely the speedometer head.
I would also advise to check the speedometer gear as well.
The speedometer gear is located on the output shaft. Inspect it for damage.
This gear rarely suffers damage because the gear from the speedometer that meshes with it is usually made of a softer material. Sometimes, the speedometer gear on the main-shaft is replaceable. A clip can hold it in place or it can be a pressed fit. A special puller is available to pull these gears on the car/truck.