I have a 1996 Ford Club Wagon van with a 4.9 inline 6 cylinder engine. All of a sudden the engine heat gauge on the dash would not work. According to the local auto parts store there are two heat sensing units located on the engine somewhere. I found one of them on the front of the engine towards the left connected to the radiator hose. I changed it and also checked the voltage running to that sending unit and according to my repair book on that model van it indicated the proper voltage. The gauge on the dash still did not work. I have looked for the other sensing unit but cannot find it. Can anyone help? Also is there a fuse located somewhere in that system?