212 - No, there is no onboard indication, I think for 2 reasons:
1) This limit was not known about when the aircraft was first designed/certified/sold and
2) As was alluded to earlier in this thread, any helicopter struggles to accurately measure OAT until its in OGE forward flight.
All helicopters have ultimate OAT limits but as far as I am aware they don't have any cockpit warning when you are outside those limits.
By comparison IAS is easy to measure especially when you are going fast!
HC