87.5 CGT

[MEMAGIL at aol.com]

Question for anyone: My 87.5 CGT's coolant gauge has been blinking for the past month...Its not overheating the fan comes on, regularly in traffic, and seems to be fine other than the annoying and scary light blinking.  I have taken the coolant resevoir out and cleaned it, made sure the float wasnt stuck, and replaced all the radiator hoses (just for good measure)and bled the radiator of any air.It also has a new thermostat.  I also order a new temperature sensor which i believe is located above the multi-temp sensor...but of course they gave me the wrong one(wrong plug)...
Until i order another temp sensor...i have been paranoid that it might overheat in traffic, so i noticed that if i turn on the A/C the the fan automatically runs on low, but since the temp sensor is indicating that the car is overheating., the clutch on the A/c compressor does not engage...
Am i hurting anything by running the fan with the A/C "on" and driving in traffic...  Even though i only drive the car about once a week...i hate driving blindly with a bad temp reading.
Also am i replacing the correct temp sender?
Thanks
Mark