So heres the deal. I have a 14 Pro 800 with a MTNTK turbo that lost the ECU. Got another one that came off a 14 assault 800 and the speedo shows high by about 3 times I would guess. Plug another one in I have and shows normal. The RMK and Assault both have same part # for speedo pick up. All the programming numbers match up the same from ECU to ECU.