My (US) airline has the world's largest fleet of a certain old technology plane. They have no lights that say "eng. failure" or "eng. flameout". You don't want to abort at very high speed for an EPR gauge fluctuating, if the N1, N2 and EGT are stable-these are self-powered gauges, whereas the EPR is powered by an AC bus. But if you are in icing conditions, you might be having trouble with the P2-P7 probes etc.
My company recently decided to reduce the abort/go speed to 80 knots, regarding annunciator lights, abnormal sounds etc which do NOT indicate a problem with the airplane's ability to takeoff and safely climb out.
