Spectacular. The tester works great! It is a great service to us cheap DYIers for you to provide the design of this super simple device and the codes to go along with it. Thanks again.
My specific problem giving a code 26 is a leaky delay actuator diaphragm at the transmission. I think I will put off this repair until later as it looks to be a pain in the a--.
The code 5 EGR problem, on the other hand, is not apparent. With the engine hot, the pin on the EGR valve moves up and down when I goose the throttle indicating that the solenoid and vacuum lines are OK, and if I suck on the EGR valve with the engine at idle, the idle speed drops about 100 rpm indicating that is operating OK and that the steel tube tube to the intake manifold is not clogged.
Now what?