Hey after seeing your pictures and relizing that you have an 88 I found this

For 88-91 Honda's and 86-93 Acura's:

The ECU's on these cars actually have a neat little window right on the computer case. No need to jump here- just turn it to on, and watch it right there through that window.

For both steps above, the output will be in a Morse code style of long and short lights. For example, 2 long, pause, 3 short is 23.