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A friend has a 1991 trooper - and his O2 light was on -- to reset it we removed the 4 screws on the black plastic trim, then removed the spedo - there were two screws. Then, we removed the spedo cable - just reached under the dash and squeezed the release on the cable, then removed the spedo.
We were expecting to find a screw to move from hole A to hole B -- but there was a switch instead! We moved the switch from position 1 to 2, and now the O2 light is off! Thanks.
 
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