Dick H..........that was a great summation of how to prop an engine depending on what style of flying you enjoy doing. It's just a matter of trial and error to match the airframe/engine with the prop that suits your needs.

As far as tach's go, I'm like DP and don't use one to tune my engines. Start both needles out at 1 1/2 to 2 turns and go from there. I like to get the low needle set to where I have a reliable idle, good transition, hopefully not much blubber in the midrange, and no sag on full throttle vertical runs. Pull the plug and make sure it's a nice tan and you're good to go.