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Y can't reset the speedometer. Your problem is the electric motor that turns the speedometer needle. I believe yours just pops in and out. But some are soldered. You can get both kinds on line.
In 1990 most Automatics had a cable driven speedo. If not...were it is connected to the trani there is 1 bolt holding in the electric speedo unit. Check the connection and or replace the speed sensor that the bolt is holding in
Speed sensor is most likely goin or gone out. It is located on the drivers side of the transmission tailshaft. Speed information runs through the cruise control and the computer to the speedometer.
hi ..
there may be separate relay for these stuffs which you mentioned as not working.check this relay if burnt out replace it and check.
2. check the fuses.weather all in good condition.if not replace and check it.
3.check the wires going to these gadjets.weather damaged.
Your tach still works because it reads engine rpm. The computer uses info from the speedometer but the signals for the tach and speedometer come from different places. I can't remember if your speedometer is cable driven or electric but the sender is on the drivers side rear of the transfer case output tailshaft housing. If cable driven check that the cable isn't broken inside (I usually put an electric drill on the cable and run the drill to see if the speedometer works (some run backwards) If the drill is able to make the speedometer work check the gear that is inside the transmission by removing the part the cable is attached to. That drives the cable. If electric, check wiring and if OK, replace the sending unit.
Are both out of the same year? Are they both mechanical or electric? Sounds like if they are electric, the sensor is not reading. If it is mechanical, you don't have the speedometer cable hooked up correctly.
ok if its a cable driven speedo then the cable has snapped or the speedo drive that goes into the gearbox is gone ,,also if its electric speedo then id go with the electric speedo in the gearbox ,,,a ten mil nut holds it in and it goes straight down into the gearbox,,youl see it from under the bonnet ,,
dash boar is electric. the fuses for that are on almost under the dashboard. like in fron of the drivers left leg there is a cover you have to pull off. but you may need to replace the cluster.
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