Any issue with your eye wires will cause problems. They may come on but the gun vibrates when you shoot which can cause them to go on and off randomly due to loose connections. Order up that new stuff and I think you'll be good to go.
Sorry about the reset button, I told you the wrong one lol.
Old school angel poppets/cup seals(LCD and A4/speed), spring detents(not sure which models) F/S