Review on Sierra International 781 683 060P Arctic Speedometer by Tom Duncan

not working, Sierra International 68982P GPS receiver connected as per instructions and all I get is an error "GPS error" . ". I thought it was defective, I ordered another one, the problem is the same. They sent both back and their GPS antenna, which costs more than the speedometer. What's the problem, the Chinese version that 3 times cheaper, works great out of the box.