12-pin OBD1 Cable: http://aldlcable.com/products/aldlobd1u.asp
16-pin OBD1 Cable: http://aldlcable.com/products/aldlobd2u.asp

I have the 16-pin version, it has always worked great. Don't bother with the garbage "16-pin to 12-pin" adapters on eBay to try to run both, they are all wired completely wrong (in a potentially dangerous way).