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Re: speedometer and tach
With the key in the off posistion press and hold the trip odometer reset button, the lights in the cluster will start to flash and the guages will do a self test. This should take care of your problem.
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Replacing the fuse the first time was the right move, becuase it could have been a fluke that it blew. Replacing it again and again was not! You should have found out EVERYTHING that the #2 fuse controlled and verified that the components weren't pulling excessive amperage (shorted condition). By replacing the fuse over and over, you might have made the problem worse by subjecting good components to something that was shorted.
BTW next time pick the oldest guy at autozone to help you, if the counter help knew their stuff they would have told you the same thing I just did!
sit in the drivers seat close the door. with the key off hold the trip
odometer button in then while holding the button in turn the key on. if
done correctly this will put the MIC (mechanical instrument cluster)
into a self test. if the speedometer does not move like the rest of the
gauges during this test the MIC must be replaced. if the speedometer
does move it is likely your problem will be fixed, however, if the
speedometer does move but it does not start working properly then
further diagnostic will be needed.
There are 2 sensors on the engine that sent a signal to the computor and speedometer and tach. When one of these goes bad it can make the speedometer and tach go all over the place and also just stop working. This can also cause all types of engine running problems because the information being sent to the PCM will be incorrect all so. The units are easy to replace once you find them, it seems that they are located in different areas of the engine with each year the vehicle was put out.