I got an air hockey at a thrift shop for 15 dollars and everything worked except the electric scoreboard. I the sensors attaches with an audio jack and it looks like the sensors are 2 LEDs so I think it uses Inferred. I tested the 3 wires coming of the jack and when when from 0 volts to 1 volt when i score. I want to put a web server on my raspberry pi to detect a score and update the website that I could open on my iPad or computer to view the score. I know some java script, java, c++ and visual basic. I know very little html, I can some what can read schematics. It if some could help me figure out how to do this. I'll add a bunch of pictures including the format i was thinking would work.
