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The speedometer and antilock brake system (ABS) are linked together. Is the parking brake light on the dash on also? If it is, disconnect the upper wiring harness connector to the ABS module under the hood for ~10-15 seconds with the key switch in the OFF position. This will reset the ABS and the speedometer. The ABS module is located next to the brake master cylinder. Its about 6"H x8"L x1"W and should have 2 wiring connectors plugged into it. If you have any doubts as to what and where the module is, you can disconnect the battery for ~5 minutes to accomplish the same thing. Down side to this is you'll have to reprogram your radio and the computer will have to relearn your driving habits to run like before.

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Q: Why is the speedometer not working on your 1991 chev pickup 1500 WT?
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