My sparkplug bit the bullet, so I ordered a new one. I ordered a NGK LB05F like the one I had before. I also have a crap load of BR8ES plugs. After reading on here what cap to buy I came across that you should not be using a resistor plug and a resistor cap. I've been using both for a while now with a sip speedo with no issues.
Why is it not good to use both? It feels like a waste that I shouldn't be using the plugs that I already have as I couldn't find a non resistor cap.