You know, a signal meter is nice, but as I've said before, it's cheaper and hard to beat wearing wireless rf headphones ($15) and hooking the sending unit to the audio out on your "beep" or "tone on scan" receiver. My Manhattan has that function, as does my Viewsat SD box.
In your situation, I would set my receiver on 83 west, Ku for Tuff or RTV, with the transponder and other settings as described in Lyngsat or in the Satellite list on this site. Hopefully your lnb setup can get Ku, but if not, use 78 west for Cband. You are better off using Ku for aiming though because it needs a more exacting aim. Before you go out to adjust your dish and in front of your TV, you make sure your receiver is on beep mode and you are getting the signal in your headphones, then you go out to your dish.
Really, the wireless headphone thing is pretty great because it has your hands free to work the dish and use wrenches, and you don't need to disconnect anything to hook up a meter. You just move and adjust the dish until you get the strongest audio signal .
I do think that people get off the arc when they set their zenith when their due south (I really don't like this term. It implies an exactness that isn't often there) satellite isn't exactly at their longitude. On my system, I average 15 counts or clicks per degree. My southernmost satellite is about a half degree east of my position, so I get zenith, then click east about 7 counts. Then, headphones on, I do the other two adjustments - turning the whole dish on the pole and elevation. Tighten at the best signal and you pretty much will be on the arc.