I tried to trigger the optocoupler with a 5v signal which did not seem to have any effect on the interrupt, even though the diode testing function of my multimeter shows results consistent with a functioning opto I now suspect it may be defective as well. I will try new ones, I also must correct myself as I did have a current limiting resistor of 47 ohms on the input. I also noticed I cannot trigger an led when connected directly to the pickups. Perhaps my o-scope readings are off and I am dealing with much less then 5 volts, this would mean an opto probably isn't needed here.

Thanks again

James Krushlucki