I'd like to know how to read the temperature on the rallye gauge. I have a '67, 400 and the gauge is marked from 100 to 250. What temperature are the intermediate hash marks supposed to represent? My car has been running in between the halfway and three-quarters area. Is this normal and at what temperature would this be, assuming the gauge is correct. I'm worried about overheating since I've heard the 400 is noted for it. The engine is 100% stock as far as I can tell.