Hello, I am replacing a 12.5 hp Briggs engine on a Murry riding mower with a Briggs14.5Hp model 31a507-1516 engine. There are a few more wires on the 14.5 engine (grey and black coming from a connector under the carb bowl). The 12.5 does not have this? I was told by the selling company after giving them the model # of my 12.5 that the 14.5 would be compatable and fit.:confused2: Can someone help fill me in on how to route these two wires back to my mower? Thanks