I also agree an aftermarket gauge is a good investment. I will have one in the near future. From the looks of your picture, I'm assuming your running a 180 stat? Is the coolant system full, no air present. Does it run at different temps while idling as apposed to highway driving? I recently replaced my waterpump and after this I ran hot real hot. It turned out to be bad ground in the start cable, which was messing with the temp sending unit. Some this to consider.