The generic Lexus OBD1 connector works. There were 2 different plugs available for OBD1 Lexus' but usually the scan tool kits come with both. Honestly, it's just as easy to just read the blinks by jumping the two pins. OBD1 is somewhat 'dumb' compared to the later OBD2 codes when it comes to finding out what is wrong so don't rely too much on the ECU telling you what's wrong.
Yes, I know it's the wrong car. Try it anyway.