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Remove the cluster and send to a cluster specialist. if he finds nothing wrong, you should not be charged for this(ask first). If the cluster is fine, check the cables and/or the sensors that run into the tranny.
If it is the ckluster, the specialist can fix and reinstall.
It doesn't have a speedo cable. Even though it is an analog dash it is driven digitally from a pick up sensor on the trans. If you look at the back of the trans from up top above the engine oil filter and back toward the drivers fender a bit you will see the round sending unit with wires comming off of it. It may be going opening up when it gets hot. Otherwise you've got a bad instrument cluster. That same sensor feeds the Cruise Control via the instrument cluster.
Don't listen to the other guy, I own a 1990 1.8L mazda protege with a manual transmission. Yes it will make it easier to hoist it up. I am not going into extreme detail so as long as you know a little about cars this will be a great help. on the transmission locate the drain plug, it will be on the bottom of the transmission. don't loosen it yet you want to make sure you can fill the transmission before you drain it. there is no fill plug, you have to fill the transmission through the hole the speedometre cable is attached to the transmission. the speedometre cable is straight up and down/vertical, it should be above the passenger side cv shaft coming out of the transmission. remove the small bolt holding it in place and then pull it straight up and out of the transmission. now drain the transmission. put the drain plug back in and start filling, make sure not to overfill you are not supposed to fill it right full. Make sure to check the fluid level as you fill, the transmission is at the right level when the gear oil is just at the top of the speedometre gear that is on the end of the cable that is inserted into the transmission. I believe these transmissions take 75w 90. Hope this helped you, and maybe future people who view this looking for help.