is called a non linear resistor. tungsten light bulb bad idea later:all petered out Use a current limit resistor and a led. At 05:03 PM 6/22/98 -0400, you wrote: >As far as reading the injector pulses, does it matter if I use an >incadesent bulb, or LED?. Just curious if having a hot filament >adds something to the mix. >Cheers >Bruce > > >