Easy way to upgrade OBD I to OBD II

DionR said

OBD1 to OBD2 Conversion---->Im going for it

There is (was?) a place selling converted harnesses, even had the cruise control working. SHOP

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That is interesting. Thanks for the link.

What would be wrong with fabbing up a custom subharness to covert the plug for an OBD I to an OBD II system, then adding extra wires as necessary?