Detroit 3-71 fuel lines

I bought a 1981 3-71 Detroit Diesel 75 KW Genset last year, I was told it ran until they stopped using it. I am going to try and get it running, but I have a couple questions. I will try to attach a few pictures. There is a fitting coming out of the head a little back of the air intake. I am guessing it is a fuel line connector that might be a return line back to the fuel tank. It is also missing the Oil dipstick and sleeve, which I will need to find a replacement. Another question I have is if I do get it started and I need to shut it off quickly how is the best way to do that? It does not have any linkage from the governor to the control panel. Thanks for your help. Calvin