I own a 2004 International truck w/ a DT466 and six speed manual. Just recently, my tach. and speedometer do not function. When you first turn the key to the on position all the gauges go from left to right, including the tach. and speedometer. However, once the engine is running the two gauges do not work. I checked the fuses located in the passengers dash, any other places to look or check??? I've only owned the truck for the past two years and do not really know much about it . Thanks, Frank