What do you need to replace to change a malfunctioning water temp gauge? I only want to fix the stock one, NOT get an after market gauge even though the readings are way more accurate like most people are going to say. My gauge stays below the C mark for way too long. It just sits there like the needle is broken for like 5 minutes and it used to get to operating temp in like 3 mins. Is it some kind of water temp sending unit? If so, links to where I can get it please!