I sent mine to Harry Wardburton in N.C. So far I am very pleased with it. I tinkered with another speedo for a friend. It was in good original condition, but was way off as far as accuracy. Him and I spent the better part of the day trying to get it calibrated with no luck. He finally sent it off also, but I am not sure who he sent it to. Here is the contact info below. Rod
Harry Warburton
104 Wilkshire Dr
Greenville NC 27858
252-752-4098