O2 light

Anyone know where the O2 light reset is for a 1989 isuzu PU?

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I assume that the light popped on automatically at 90K miles or some higher multiple of 90K.
I believe that the reset mechanism on the '89 will be the same as my '91 pickup. You must remove the instrument cluster and transfer a small screw on the back of the panel from one ground connection to another.
My truck has 215k on it now and I've had to do this twice - once at 90K, again at 180K.
You can find the details in a good repair manual or at alldata.com.
Rich...
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