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With the oil system i would say that oil flow, oil pressure, pump turning, pump current etc. really wouldn't be necessary. They all add up to the same thing, an Indication that the drive motor needs to be stopped.
A simple temperature monitor on the motor would give an indication of all those other failure modes. The motor temperature goes up higher than expected from current load, passes a set threshold and then warns the driver.
Maybe a gradual power reduction as the temperature got more and more away from expected values. As auto shut down of the motor could be dangerous depending on the current driving situation.
The temperature sensor would also tell you if you are able to drive at a greatly reduced load in order to get yourself home. Sort of like an ICE engines limp home mode (grumble mode).
These extra sensors would be helpful in fixing the problem but once you are able to start looking at repairing the problem you presumably would have the time to measure many of these things directly or at least diagnose them.
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