gulliBell,
@Lonewolf_50: I don't know the 225, but I don't know of any helicopter with an indicating system that senses oil return flow (or oil supply flow for that matter, whether that be in an engine or gearbox).
The only aircraft that I know of that does the above is the S92, however, only for the input modules. My understanding is, the left MGB oil pump is responsible for scavenging the left input and the right MGB oil pump for scavenging the right input. Basically there is a vacuum switch in the oil return from the modules and if the vacuum is lost then the cockpit gets an indication that the left or right pump has failed. If ignored, there will be a rise in oil temp with an eventual over temp of that input. Pretty sure standard procedures are to reduce power to the effected side until landing. Again, this is only for the inputs, anything inside the MGB module itself would have no indication.