trying to figure out the "ata" gauge

[MadBlaster]

Likely the spit's constant speed unit won't allow you to do as much damage with the governor in place, verses 109 where you can directly control the load (in manual prop mode) and screw it up really fast. In other words, they probably designed the CSU as much as possible to mitigate the extreme situations on the engine (lug and over-speed).