He needs to verify what he has first. Usually under the hood, you will find an emissions sticker that says something like OBD1 certified, or OBD2 Certified. But it won't say OBD 1.5. OBD 1.5 was used during 94 and 95 as a test platform before the govt made OBD2 mandatory on all US vehicles.
To tell the difference, the OBD 2 connector looks just like the OBD 1.5 connector, but the OBD1 connector is different.