I seem to be having some difficulty in locating the CORRECT water temp sending unit for my 1993 Mustang LX 5.0. I have purchased several, Standard products, Autolite, and Motorcraft, with the same results of temp indicating too low on the instrument cluster gauge. All other gauges are performing correctly. I have checked the gauge according to my Ford shop manual using a variable resistor, 74 ohms for cold and 10 ohms for hot. The gauge seems to respond well or at least within some small...

Temp gauge