I have a Raven 440 that uses magnets around a front wheel to give the speed input to the unit. My question is, is that the same input as one that uses radar? The plug in looks the same 3 pin plug. I want to input speed from a Trimble 750 with a radar output cable. I would have know idea how old the unit is, but it has worked flawlessly for years. Would be using this for side dressing liquid nitrogen.