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.
this is normal for all cars. this old, ! what is your question. most Geo speedos die at 150k miles. you forgot to say, did odometer die too? big time error that... for any accurate answers.
my guess, is , you are asking how to diagnose the speedo, right? ok pull the cable at tranny, and spin it by hand (or drill) in the same direction as the needle moves, in dash. mine is CCW direction so spin it in CCW dir. and see if the needle moves up scale. if not , maybe the cable is snapped, inside. so pull the cable out. is it snapped? if not the head is bad, if both the speedo and odometer are dead, here is one page showing how to do that. if both are dead , it can only be 3 things. 1: BAD HEAD. 2: BAD CABLE 3: tranny gears x2 bad,one or both stripped, (plastic gears) the test is easy, spin it from down under. and look. do not pull the cable down under or the cable will disengage the head, and slip (simple sqaure drive it is) gettting the head out is another long story.
Check the transmission where the speedo cable goes into. It's located at the back of the trans. Removed the small cable retainer bolt and pull the cable out. See if the gear is broken. If it's not broken, have an assistant watch the speedometer in the truck and spin the gear at the end of the cable by hand as quick as you can and see if the assistant see if the speedo moves. If it doesn't move, replace the cable. It's most likely broken inside the housing or where it attaches to the back of the speedometer.
Those are analog gauges. They have no fuses! The speedometer has a cable that spins in a hole at the back of the speedometer. If it is not spinning the cable needs to be changed or lubricated. The temperature gauge connects by a wire to the temperature element on the block of the engine. Either the wire is broken or the sensor element is shot!
The needle bounce may be related to the cable, it may be broken or just needs lube. Remove the speedometer cable, locate the connection at the transmission and unscrew it, then locate the connection at the rear of the speedometer, remove the cable from the car, pull cable out of plastic housing and see if it comes out in two parts, if it does then cable needs replacing. You will see the cable has two ends, is the cable is broke replace it, a broken cable will sometimes spin and not spin causing needle to jump, also a binding cable will do the same, if cable is good then spray wd40 in to cable and spin by hand. note; if cable is binding you will need to work it so it does not break. good day
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