I have 1973 euro spec 911 T with Zenith carbs.

Can someone tell me what this micro switch does? The carb arm is meant to touch it on tick over I think, however its been adjusted not to touch it.


Also the top fuse is missing from the rear fuse box, which again I think is meant to do with something with a solendoid on one carb. but someone has put in inline fuse in one of the cables and not sure if it is needed. From the picture am I also missing a relay ?


Thanks

Mike