I have a Craftsman riding mower 12hp i/c Briggs. In has been worked before i got it and i don't think it a a governer hook up. It revs up HIGH. i'am just runing it about half speed. I would like to know how high it is to high? I guess am asking what rpm is max? And will a auto tach. meter work on it or do i have to guess what max is? Thanks David