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Hmm.
Disconnect the battery, check if the alternator fuse is in good shape, if it isn't - replace it.
Then take your dash out and check to see if there are any loose connections to the digital speedometer.
But if it hasn't worked AT ALL for a while, then it could be the transmission sensor like cal40 and rogoman said, but it's pretty hard to DIY.
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"Keep racing off the street, and drag on the track."
'89 240SX XE
(KA24E @ 30k mi.)
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