This is a combination temp & pressure gauge I found in a local heating supply house. They are common in hot water heating systems.
On the 16-2 I just completed, I switched over to all stainless steel lines. If it is ever an issue on this one, I'll make up new SS lines for this engine as well. There is a 3 way valve at the injector pump where I'll feed fuel once this lands in a permanant home.
Thanks for the comment. It has been a fun project.
I did build my 16-2 Genset with the box fan. I used an inexpensive 120VAC fan for the cooling. I found this 19: rack mount cabinet cooling fan that I used on this one. If I find another one, I'd put it on the other unit and eliminate the box fan.
Here is a picture of it.
Bob