its a 1990 civic hatchback Si.... and no it has never worked... i have the unit right in front of me.. it mounts on the back of the gauge cluster, has a 5 pin hookup on it, and a light coming off of it that goes into the shift indicator spot (the green arrow pointing up) .. i mean i dont shift at stock points anyway, i was just curious about it... figured if i got em to work id sell em on ebay or something.