Use a LED, run it at 3 mA and problem is sorted for life.
I use a 66 k.Ohms 2 watt resistor for 230 Volts ( 2 x 33 K ohms 1 watt in series )
Then a 1 N914 diode antiparrallel with the LED.
For anyone knowing basic soldering and tidy working it is a easy to fit in any switch with perfect results. also no heating in the resistors.
For 110 Volts design the circuit to run at about 3 mA which is ample for a high efficiency led. a single 33 or 39 k Ohm 2 watt resistor will suffice.
I have found neons with the incorrect series resistors which means excessive current and a short lifespan.
