No one is really going to be interested but here's the answer.
TC is RIGHT! awful thing to have to say but there goes.
The MMI in a Bo105 is a conventional round dial with a single needle sweeping in a clockwise arc from approximately 7 o'clock to approximately 5 o'clock. About 1/3 the way around the sweep is a single black. marked radially relative to the dial. The RFM states that it may be used to check the forward CofG in the hover. The last part of the sweep is coloured yellow to indicate nearing the limit of mast bending and finally a red line. Hitting the red line (or indeed exceeding it - tut tut) will illuminate a red light, co-located on the dial.
So - no special technique, just don't light the light
I must get out more