I recently bought a 1970 Mustang Fastback - 351 Cleveland 2V - temp guage wasn't working - replaced sender unit - it worked but temp reading appeared too high - 3/4 up the guage at operating temp. Had radiator & engine flushed - very little dirt etc, couple of small leaks fixed, new 180 degree thermostat (suited to Clevelands) installed, new coolant. Guage still read the same. Replaced sender unit again with one suited to Mustang guage - guage now reads past H after travelling only a short distance. At operating temp coolant is 182 degrees, coolant doesn't flow out radiator when cap is off, doesn't bubble at fast idle, combustion test okay, can put hand around top hose, water pump OK, no oil in radiator, no water in oil,no significant loss of coolant, belt tension ok, engine runs smoothly. Can only assume a guage problem. Spoke to auto electrician who said he needs to know ohms resistance readings for guage. For sender unit it is 220 degrees 18.49 to 15.75 ohm, 100 = 150 to 100 ohms.
Can anyone help me please - please email to
spookie_1984@hotmail.com
Have a great Xmas
Temperature guage problem 1970 Fastback 351C 2V 
