well, I'm still playing with the tweaking of mine and I check max air flow and rpm quite often.

I have some jobs lined up which might provide me with a stand alone, so the s-afc could be eliminated at some point in the near future.

 

does anyones actual rpm's match what the safc says your rpm's are? I had to set mine to 4 cly. just to get close and its still off by 500-700 rpm's