So I've been having this issue past 2 weeks with my 1995 5.0 where the gauge would only rise just before the N in normal and little after the C. I've already done the Thermostat TWICE, my Temp sensor is fairly new, Its an NTK sensor. I bled my coolant system when I did the T stat twice and the coolant level is fine. Whats funny is that I hear the Cooling fan turn on then off again like it would normally on a operating temp engine. What else could I check?