Hi Doug Its funny, I was just discussing this on the Smokstak Forum. See generators, Subaru engine. At this time it’s about 5/8 way down the page.
In the past I have used a Subaru cruise control for a gas engine pump governor but not a Gen governor. The pump had to maintain a certain pressure as to not damage the valving from valve surges. I had to install an orifice to dampen the actuator and then adjust the size from there. It held quite well but did have a bit of over swing. I didn’t need to adjust it any more so I left it alone.
I think with a little/lot of tinkering it could work quite well.
Bluecometk