Ha, never had a gauge on any of my bikes, i mean i guess its cool to have, but like i said if you can feel the side of the cylinder without burning yourself like an exhaust pipe, your running fine, about your jetting, did you notice a power drop?? Your plugs sound to be fine, post a pic up if you want (at low speeds) - 1/4 throttle? I jet my bike more on heat than plugs personally, but i pull a plug to make sure its not terribly off atleast.. It will run hot if your lean or rich - so keep that in mind. I can put my hand on my cylinders for atleast 3 seconds comfortably, all day long.
Eric