do you have an IR temp gun? they're cheap, and can save a lot of guessing. you can point and shoot, getting exact temps from the hoses, heads, intake and even the radiator. several guys have mentioned it, and it's a great investment. i even use mine to look at exhaust temps coming right out of the ports, looking for misfires (colder) or a lean cylinder (hotter). i'd trust a digital IR reading before i'd trust an electric gauge and sending unit.