Ok I was remembering that dyno's read off of the ignition for the rpms(guessing here) will there be a problem if he doesn't know what to set it to? I mean since most of the stuff that reads off of the ignition has a selector type thing: 4cyl=6cyl=8cyl etc. which one do I tell him? for some strange reason I think it is 6 but I am not sure.

 

Oh and also would colder or hotter plugs be better for a dyno run?