It was a nice day here in NW Florida, so I took the '68 convertible out and while I was driving I noticed that the temp gauge never came up to the normal position, which is around the center of the gauge. It hovered around 1/4 of the way over from the left-- not even in the little "boxed" area on the gauge that gives you the normal range. I drove the car long enough for it to warm up, and it's 87 degrees down here. The last time this happened on a car of mine the thermostat was bad and the car overheated. What could be causing the gauge to stay so low? Thanks, Mark