When I did my engine in 2012, the shop installed the P3, but at that time, I was unaware that there even was a relay. The instructions I got required a 10 gauge wire directly from the back of the ignition switch and to remove (bypass) the pink resistance wire. Now I have to install a resistor so that the new re-rebuild can be set up with points again until we get my ignition wows sorted. So, my question is this; can I install the relay and then reconnect the pink resistor wire, or is it best to still get the power from the back of the switch. I know it has to be full 12V from a switched source? Comments? I think this may also help the original poster.