I really would be interested in the IR garage door limit switch idea if someone has figured out how to wire them up so as to interrupt the pump circuit when the beam is broken.
I am wondering if the garage door sensors are stand alone units, or are they dependent upon the opener circuit to...
I saw your post over on the tri five forum. good luck with the build. I own a 1955 chevy rotisserie resto mod with a LS1 & 460E set up. I absolutely love it!