I must say I've always found it a bit strange that all carb equipped helicopters have a carb temp guage, but they seem pretty rare in fixed wing. Helicopters use a degree of carb heat nearly all the time to avoid carb icing and particularly when ground idling before takeoff. It was interesting in the Bell 47's which had the sensor at the intake that you had to use carb heat to keep the indication at +32 Deg C to keep out of the icing band. A reminder that there can be a 25 Deg C drop in temp between the intake and the back of the butterfly. I know there are other differences like all carb air is filtered in most helicopters unlike FW where cold air is usually not, and most heli engines are de-rated at ground level and therefore the butterfly is nearly always partially closed, but the idea of only checking for carb ice every 5 minutes has always made me feel a bit uncomfortable when in a fixed wing.