fuel pump indicator flicker

the light is probably operated by a pressure switch, either the switch is going, or the electric pump, only way to figure which is to put a pressure guage in line and see what is going on

My electric fuel pump indicator light has a constant flicker.  Yes, it will glow bright red if my wing tanks are empty and it is pumping air.   Is the flicker indicative of a weak electric pump?      Jim K.    1946  415-D  100 hp. engine