Quoted from Gotfrogs:
Sorry for the dumb question but what are these? I tried a google search for MRS pinball but did not get the answer I was looking for? Are these replacements for a broken component or do they have some kind of advantage over what came stock in the game? Thanks!
They are Proximity sensors (tell the machine where the ball is) for certain items on the playfield such as Ringmaster in CV. Really important! If they go bad, your machine suddenly sucks to play. Right now these Reed Switches are unavailable and maybe for some time.
It’s people like Sonic that step up and help us out with these problems. I am picking up a couple of these. I would recommend that others do so as well.