I’ll try and get a picture tomorrow. I remember using it to diagnose an ABS fault. I used a paper clip to bridge two ports and counted the flashes before and after a pause. Then used FSM to work out what they meant. I think it may also read cruise control faults.
My truck is a U.K. 1994 1HDT
I’ll admit to being totally ignorant here. I thought the diagnostic port under the bonnet, that you typically jump with a paper clip and count the flashes, was OBD1….?