Moving the triple Tach had more to do with the Bristow Mod designed in their mind to prevent Loss of RPM actions.....part of which was disabling the Torque Limiting system...which also removed the Torque Damping which made Torque Control really dodgy...and led to lots of overtorques and a mod to the mod for a system to record overtorques.....and ultimately the whole mess was **** canned and the aircraft returned to Factory Spec.....as I recall it.
The moving of the control panel was done by other operators as well....not just Bristow.
I do not know of another Operator who used any such Mod as the Bristow Torque thing.