Here's a little tip. EGT's are a probe that is placed in the center of the exhaust gas stream. Depending on the sled, they are mounted approximately 3-4 inches down past your Y-shaped header pipe. Placement is critical for accurate temps. The EGT only reads accurate at WOT on a warm engine and warm pipe. So, you basically have to hammer it across a lake to get the highest reading; which should always stay below 1300 degrees F. This would generally indicate that your jetting is safe. Now, if you do this, and your in a safe temp zone, you've only achieved one piece of information on your engines performance.
Piston wash and spark plug color are other things to monitor your engine as well. EGT's can definitelly help out, just remember that when your moving at WOT, a small analog gauge is VERY hard to read. Large, clear, and accurate digital gauges are nice to have if you can afford one. Hope this clears things up a bit.