My temp gauge is stuck in the lowest possible reading all the time, i have the sport dash with the temp, volt, and oil gauge in a 1980 Malibu. I looked through some videos on youtube and everybody suggested that a ground wire on the engine-block was usually the cause when gauge is stuck at lowest reading, but to my surprise there was no trace of it... I also noticed that on top of the engine one of the things that looks like sensors didn't have any vacuum lines... Can anybody shine some light on this issue, is the ground wire possibly placed somewhere else on the Malibu vs caprice/truck? or is the disconnected sensor-thing the culprit? Its the blue thing to the right above the radiator hose that is seemingly not connected to anything, is this the sensor possibly?