OBD2a-OBD1 or OBD2b-OBD1 conversion harnesses.

Both are brand new. Would sell for $85 ea with shipping to lower 48 states.

PM for details

 

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OBD2a-OBD1 or OBD2b-OBD1 conversion harnesses.
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Are they both the same harness, or are they different ones for a and b?

 

They are different. You need to specify OBD2a or OBD2b.

 

how do u know obd2a from obd2b?

 

OBD2a is 96 up to 99 for most models.
OBD2b is 00+

It varies with models though. Just let me know which car you have and I'll let you know which one you need.