So here is one for you... My Daytona 955i is a 2000 with about 24k miles on it. I took it out last weekend when it was nice out and had a problem, as soon as i started it up the temperature gauge was spiked in the red. That was the only symptom I noticed at the time. When i got it back home i let it cool down and from then on when i turned the key the gauge would be spiked in the red. So yesterday knowing that this weekend is supposed to be gorgeous, I tore the bike apart to try and get a better idea of the problem. i was able to get the gauge completely out of the bezel (good god that was a hassle) and i disconnected what i thought to be the power and the ground wire. ( one was yellow one was black, there was a red and green which i think was the information, and a bundle of 3 wires to the side which i am pretty sure is the background glow) so after pulling out those wires and re tightening, the gauged seemed to work, i would start the bike and it was not pinned in the red, it was in the normal range, It stayed normal until the fan kicked on (i did not notice it only spiked when the fan kicked on until many trial and error runs) when the fan kicked on it would instantly spike. So at this port I am thinking let me make sure the coolant is full and everything else is normal, I open up the cap and it is full but probably the worst shade of green/brown i have ever seen. (i did not look at cooling when i purchased the bike and it is such a pain to check that i never did, now after looking at it i think he put a "stop leak" additive in the fluid) i did a coolant flush about 6 or 7 times till all of the nasty **** was out. i have tried everything with this gauge. I ran it with no thermostat and sure enough the temp spiked when the fan came on, i ran it with the cap off same thing, when it spiked i disconnect the temp sensor and put in ice cold water and it did not drop back down. If this all is not weird enough, when the temp sensor spikes you have to wait for the engine to cool down and then disconnect those two line from the gauge itself for it to reset and work what i think is correctly.

any ideas guys?