Bill,
I received my unit yesterday. I was concerned about the size since the box was so large. While I work on other projects I have a few questions that I have in the meantime.
I have had success by connecting the Glow plugs in series using a 3V power supply. I run a wire between the engines and connect the positive to one glow plug post and the negative on the other engines glow plug post. Will the twin sync support that system for glow plug ignition?

Can I select the RPM were the GP heat comes on?

Sparky