Thanks for the quick response. It's an 80 MPH from a 1-ton AD truck. I think I have a spare to try it out on again as you say. But my spare is a 90 MPH from a junkyard find. I'm not overly concerned with accurate velocity reading via the speedo but I would like to see the needle move for the sake of moving. I can watch real speed on the iPhone. And 1-ton duallys aren't breaking any speed records !!!!!
BTW DADS50, your truck's story, the videos and photos are a genuine inspiration. I've been following it for years. What a story. - Joe