Yesterday I re-installed the CSM Revlock and test flew the Mongoose and although iy appeared that the governor was working I could not set the correct headspeed which when tached, was alway lower than I had set.
After double checking my setup (ration, engine speed etc) and test flying a couple more times I decided to switch back to the Futaba GV-1 in which I set the same ratio and target headspeeds.
Again I had a friend tach the actual headspeed when flying and it matched that set in the GV-1.
As I "borrowed" the Futaba GV-1 governor from my Align Trex 600 Nitro I decided to replace it with the Align RCE-G600 governor.
Installing it was very easy with the sensor bolting on to the outside of the frames.
Setup on my JR 12x radio was also easy using the governor function allowed me to change headspeed from the radio and have a different speed set for each flight mode.