Originally Posted by new94

if it's the GA16DE then it's just under your distributor hidden a little, it's a small brass nipple type thing that threads into the engine. It has a single wire going to it, if you have the new one ready then you can quickly switch them without losing alot of coolant only a small stream will come out but make sure the car is cold! My guage quit working so i replaced the temp sensor and it's fine now, good luck.