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should be below the dash. Not sure if all GMs were the same back then but a 1990 I had you could use a paper clip and connect the first pin with the one below it and the check engine light would blink in different series and then you take those numbers and look up the codes online.
 

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should be below the dash. Not sure if all GMs were the same back then but a 1990 I had you could use a paper clip and connect the first pin with the one below it and the check engine light would blink in different series and then you take those numbers and look up the codes online.
:yes:
 
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