It does, I fly (irl) a plane who does have one.
We even generaly idle at 1800 (more stable at this regime). The 912 100ch use a 2.43:1 reduction gearbox.
But yes, the plane is broken, the airspeed indicator don’t work, we have “overspeed” alert when we use flap à 0° (it’s the defaut setting for god’s sake !, -12° is for hight speed cruise), etc… etc…