Yeah, that's the computer. If you open it up you can replace the chip/tuning card with a more hi-performance one (results were not what I was hoping for) got mine from Summit Racing - not sure if they are still available. My '88 has the same computer mounted under the right side of the dashboard. Not sure when this law/requirement started but the OBD should be only on the driver side somewhere under the dash. Now I know the '88 and '84 have different dashboards but they are both GM engines. My Data port was hidden pretty good under the dash to the right (or was it left) of the steering wheel. To me it looked kinda like a 4 plug trailer connector. Look again - it's there somewhere. I would think Google would have the codes available!