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I think you should pull your spark plugs and read them. If the advance is causing the motor to run hot your spark plugs will tell you. They would be very white with “pepper” spots on the tips. If you have been riding a lot of miles with the ignition too advanced it should be obvious even if you have ridden a few low speed miles afterward.

With the stock temperature gauge and sender I don’t think you can base much on the movement of the needle. More like the idiot light early warning system on a car than a accurate gauge you might need with the mods you are doing. Regardless, read the plugs to see what they tell you. It may be necessary to give her a little more fuel at the upper speeds to offset the advanced ignition. I would expect the fan to come on if the temp is getting high. My fan never comes on when highway riding no matter how fast I am going. I rode to Reno about 3 years or so ago and hardly ever got below 90 miles an hour. the temp outside was in upper 60's when I left and in the 70's when I got there and my temp hardly reached “normal”. I sure went through a lot of gas though.
 

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I read where you are wanting to get a thermocouple reading for the coolant and agree that may be what you will really need. the outside of the block gives you information but I don't know how that will translate to the coolant temp at speed. You may be able to "tap" ito the coolant system in the thermostat assembly. Perhaps even removing th bleed and placing the thermocouple there. I'm not sure what size the threads on the thermocouple are but it might be close.
 
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