Hi Rick,

I am not trying to scare you here, and let me say all of the previous post are correct, you have nothing to fear. One thing no one has mentioned is, when you have your engine close to being tuned optimally, (which it sounds like yours is) small tweaks of the needles go a long ways. 1/8th Turn might put you on the other side of where you are at. When you are really close, 1/32nd can sometimes be all that is needed. Let me restate you have nothing to fear get the tach out and if you don't like your results turn it back to where you had it.

Kurt Cook
Fromeco Scale Avionics LLC
www.fromeco.org