Originally posted by Andy
Most likely he hooked a computer up to your diagnostic port and read the codes that way. If you put an OBD I ECU, the diagnostic port may not function anymore (I think that was an OBD II addon).
Since the tech gave the actual OBD-II code rather than a CEL code I'm thinking that he scanned the diagnostic port as part of the test, and the diagnostic port is indeed a feature exclusive to OBD-II cars.
It also seems to be the consensus that the CKF sensor was added for some reason when OBD-II was introduced.
So...since you need to run an OBD-II ECU to keep the diagnostic port functioning, and all of the OBD-II ECUs out there will want to have a CKF sensor plugged into them, it looks like your only solution for passing emissions will be to get a CKF sensor added to your car somehow.