I just recently bought a 1980 F-250 pickup with a 460 engine that someone put in it replacing the factory engine. Any how I found an extra dipstick on the front of the engine just behind the water pump? It does not look to be a oil dipstick. There are no markings only letters and numbers? What is it for? The oil dip is on the right hand side and the auto tranny is in the back on the left. I'm very puzzled? An thoughts or answers would be appreciated. Thanks Scott.