Duraspark II- Engine Speed Module
It has the duraspark II ignition system. I have several versions
of wiring diagrams for the duraspark some mention a device
called an 'engine speed module'. This is in additon to the duraspark module w/blue insulator. I have this module on the van
its located behind the firewall (under dash somewhere I'm assuming). Can anyone tell me what this device does? Is it
necessary for the durapsark II to work?
Thanks!


