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Old 09-19-2017   #8
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Join Date: Aug 2006
Posts: 2,057

Re: Digital dash help

You cannot use an 88 ECM to run a 91 TPI.
The 2 are completely different sensor setups.
86-89 are mass air flow sensor.
90-92 are speed density sensor.

That link is perfect and has loads of pictures to refer to.
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