HAndyman
Knows what a fatty is.
Yep
Bingo
Pulling to open, spring return.
HAndyman ... Maybe my ignorance is showing but what is the handle apparatus between the two temp gauges?
Air intake control.
Bingo
Looks like he has Bicycle brake cables running to the intakes. Turning the handles pulls or pushes the cables operating the intakes open or closed.
Pulling to open, spring return.