Because when both engines are working hunky dory, the max normal power is 100%. I think its all about norms and visual perception.
The gauge is showing no1 engine at 95% and no2 at zero (the picture was actually taken on the ground, power/bty off and the gauges read random values). If this was in flight, and you had other indications of an engine failure, you would expect that under twin engine conditions, you would have been pulling about 45-50% Tq.
Most of the other engine related gauges in the Lynx (that have a % value) read plus of 100%. I think it is because 100% is used to interpret the 'norm'. However, the NR and NF (rotor rpm and free power turbine speeds. Pic below) sit together at about 107% in normal flight. Dunno why.
Thats my spin on it. You would need to ask Westland and Rolls Royce for the definitive.
