Andre,

I think I can help you find the air governor. Locate the starter and the starter solenoid on the starboard side of your engine. There should be an 1/4" air hose close by. Follow the air hose traveling toward the back of the coach and you will find the air governor.

My air governor crapped out while I was dry camping. Next morning when I started the engine it would not go in gear. I checked around the air governor area and sure enough I could feel an air leak.