I used the resistor with my Painless Harness , duraspark II and MSD blaster coil { according to MSD the resistor is required with this configuration }
When i went to a MSD " Ready to Run " distributor i removed the resistor but left the wiring for the resistor and zip tied it up out of the way and out of sight. { it uses two female spade connectors and i used a male/male connector to connect the ends} Just in case i want to go back to the Duraspark II .